There is trouble afoot at Monza, the scene of the famous and historic Italian grand prix.

On Tuesday morning, Italy’s finance police the Guardia di Finanza entered the Autodromo Nazionale to investigate seven people involved with the operation of the circuit.

According to Il Giorno and La Repubblica, the Monza prosecutor suspects tax offenses, false invoicing and other discrepancies in relation to Sias SpA, the circuit operator, between 2007 and 2012.

Among the suspected offenses is the issuing of invoices for non-existent transactions in order to show a positive balance sheet for the running of some events.

The officers raided the Sias offices and also the home of the circuit director, Enrico Ferrari, and other high ranking officials.

Ross Brawn should be firing on all cylinders as he returns to the pitwall in Monaco this weekend.

Mercedes’ team principal sat out the recent Spanish grand prix due to illness, but a scarcity of extra information triggered speculation.

One rumour was that he is seriously ill, whilst another was that his absence may in fact be due to his German employer’s high-stakes spat with Bernie Ecclestone.

The latter theory gained traction since Barcelona, with acting team boss Nick Fry taking a much higher than usual profile, including naming Paul di Resta as a possible 2013 successor for Michael Schumacher.

Explaining his absence, Brawn told Bild newspaper: “On the Tuesday before Barcelona I felt unwell so I went to the doctor and then stayed a night in hospital for some tests.

“When I got home, I decided on the advice of doctors to give myself a weekend off, to be sure that I am fit for Monaco,” the Briton said.

Partly because of Brawn’s deputy Fry’s recent comments, and also due to his paltry points tally and his crash with Bruno Senna, rumours about Schumacher’s future have intensified since Spain.

“A lot has been said and written,” acknowledged Brawn, “but we should not forget that we – the team – have let him down in three of the fives races, not delivering the job we should have.

“We must do better,” Brawn, who worked closely with Schumacher during the seven time world champion’s ultra successful Ferrari era, added.

“We saw Michael’s real quality again in the first race, so it’s for that reason that I believe we will see him on the podium this year.”

As for a possible contract extension for the 43-year-old, Brawn insisted: “When the time comes, we will sit down together and talk about the future.

“I’m sure it will become clear very quickly in what direction we will go.”

Formula one is worth about $8 or $9 billion, as the sport’s owner CVC confirmed it has this week sold a 21 per cent stake to new investors.

News of the sale coincided with the launch of pre-marketing ahead of one of the biggest ever sports floatations, data by the financial experts Thomson Reuters shows.

“It’s cheap compared to Facebook,” chief executive Bernie Ecclestone told reporters on Tuesday, confirming that the Singapore IPO looks set to go ahead soon “with no dramas”.

“All the things that have to happen have happened. It will be finished by the end of June,” the 81-year-old is quoted by the Telegraph.

F1′s new one-fifth owners are US managers Waddell and Reed, the powerful Blackrock and Norway’s central bank Norges.

“It’s a great way to start the IPO and lets investors know what they can expect,” said Ecclestone.

The diminutive Briton said he is keeping his 5.3 per cent stake, and staying in charge. His former wife Slavica controls another 8.5pc, the news agency Bloomberg said.

“You might as well have asked Frank Sinatra who he would appoint to replace him,” Ecclestone insisted.

CVC said in a statement that is remains F1′s biggest and controlling shareholder.

Felipe Massa’s formula one career is on the brink of collapse.

Ferrari boss Stefano Domenicali left Barcelona insisting he expects the struggling Brazilian to “fight back starting in Monaco”.

“We absolutely need his points to also fight for the constructors’ title,” he said.

Earlier, the Maranello based team said on Twitter that Ferrari is “disappointed with” the 30-year-old’s performance.

When asked about that comment, a Ferrari spokesman told the Sunday Times: “It was a poor choice of grammar. We are disappointed in the outcome of Felipe but not with Felipe himself.”

But the very latest development is that Ferrari is now making it abundantly clear that Massa needs to up his game immediately.

In a statement posted on its official website, Ferrari said Massa’s teammate Fernando Alonso “has always maintained a very high level”.

As for Massa, his “drop off has made itself felt”, the report stated.

“The Brazilian had picked up 49 points two years ago and 24 the following year, while so far this season he has just 2,” said Ferrari.

“Everyone, he more than anyone, is expecting a change of gear starting right away with the Monaco grand prix”, the statement concluded.

Even Massa’s strongest supporters in Brazil, like the O Globo journalist Celso Itibere, admit the situation is dire.

“He is at risk,” said Itibere, “his decline is progressive, he is failing to react and he runs the real risk of not finishing the season.

“At this time Ferrari has no one to take the job. Everyone they would like to have there – Perez, Kobayashi, Webber – are not available.”

Tuesday’s edition of the Italian sports daily Corriere dello Sport will report that Massa’s ousting is imminent.

And the latest edition of La Gazzetta dello Sport did not even once mention Massa’s name. “It is as though he does not exist,” wrote the Brazilian journalist Livio Oricchio in O Estado de S.Paulo newspaper.

“Yet it is an Italian newspaper, and he is a Ferrari driver.”

When asked if he fears for his F1 career, Massa said in Barcelona last weekend: “No. I live in the present. What will happen will happen.”

Asked if he is afraid another bad performance will seal his fate, Massa insisted: “I’m not afraid of anything, especially criticism. It doesn’t affect me.”

Ferrari’s title tilt could hinge on the competitiveness of the updated F2012 this weekend in Barcelona.

“What I want is to have a competitive car in Barcelona,” insisted the famous Italian marque’s president Luca di Montezemolo on Tuesday.

“That’s what I’ve asked for,” he is quoted as saying by Brazil’s O Estado de S.Paulo newspaper.

Ferrari had congregated at its Fiorano test track, to watch Jacques Villeneuve drive the 1979 single seater to mark the 30th anniversary of his father Gilles’ fatal crash.

But Montezemolo’s disappointment is with the latest Ferrari, which has been heavily updated since the Bahrain grand prix three weeks ago.

“Our technicians are confident, but we will have to see how our opponents have advanced too,” he added.

O Estado de S.Paulo correspondent Livio Oricchio claimed “Montezemolo knows” that anything other than a big step forward in Barcelona will mean Ferrari has to “start thinking about” its 2013 project instead.

“Now we have to make a quantum leap, to have a car that is more competitive, less difficult to drive, and gives confidence to the fans,” Montezemolo is quoted by La Stampa newspaper.

“Let’s see how it goes in Spain,” he told Rai television.

“I have asked for an extraordinary response from our engineers,” Montezemolo is also quoted as saying by Italy’s Sky Sport 24.

La Gazzetta dello Sport, meanwhile, quoted lead driver Fernando Alonso as saying: “Our goal is to be world champions in November, and if we are to succeed then we must do better than we have done so far.”

Team boss Stefano Domenicali agreed: “We expect a significant evolution that will bring us closer to the step we need.

“The Spanish grand prix is definitely open, as is the championship. I say this because we believe.”

Sauber was the team with the biggest update package as F1′s ultra-rare in-season test began on Tuesday.

Kamui Kobayashi was in charge of the revised C31, which including a new exhaust and front wing represented “the biggest update package” of all the teams at Mugello, according to Germany’s Auto Motor und Sport.

McLaren, in contrast, have taken “no great updates” to Tuscany, which explains why Lewis Hamilton and Jenson Button have left the task up to the British team’s test drivers.

It was a similar story in the Mercedes camp.

Williams’ Valtteri Bottas, however, was in charge of testing a new McLaren-like exhaust for the FW34, while Ferrari also has a new exhaust for the F2012.

On Thursday, as the three-day test wraps up, the famous Italian team will debut other developments, including a new engine cover and sidepods.

A new front wing, nose and floor will only be ready for Barcelona.

There were no radical modifications on display by Red Bull, who instead want to use the Mugello test to work on car setup.

“We still need to learn how to get the most from what we have,” confirmed Bahrain winner Sebastian Vettel.

For that purpose, the Ferrari-owned Mugello circuit might not actually be the best venue.

“It’s great for driving,” said Mercedes’ Nico Rosberg, “but for the engineers Barcelona would be a bit better because there are all types of corners.

“At Mugello they are mainly fast, and virtually none at low speed.”

Ferrari’s task is to improve step by step, rather than make a quantum leap in Barcelona next weekend.

That is the claim of Spaniard Fernando Alonso, as the famous Italian team disappointed some headline-writers on Tuesday by not launching a ‘B’ car at the Mugello test.

“We have to take a step forward in Montmelo, one in Monte Carlo, another in Canada, and so on,” Alonso is quoted by La Stampa, after topping the rain-affected first day of testing on Tuesday with the improved F2012 car.

He acknowledged that Ferrari cannot win the 2012 season if the performance of the opening four grands prix is repeated throughout the season.

“We have to be qualifying in the top ten, fighting for the top five and having both cars in the points in every race,” he insisted.

Asked if he thinks the title is a realistic goal, Alonso said: “We are optimistic.”

He said he pushed as hard as he could in Australia, Malaysia, China and Bahrain with a sub-standard car.

“It was like walking on a wire a hundred feet up,” said the 2005 and 2006 world champion. “If you do one thing wrong – hit a curb in qualifying or miss a braking point in the race – you’re not in the top ten.

“We do not have the fastest car, but with a team like Ferrari, a good car is enough.

“I’m not the best in qualifying, or in the rain, or on the street circuits, but I try to be a 9.5 in everything.”

Mark Webber has denied signing with the Ferrari team for 2013.

Spanish media reports, indicating that a letter of intent may already have been written, said Fernando Alonso favours Australian Webber to replace the struggling Felipe Massa.

The reports also said Webber, 35 and with an expiring Red Bull contract, could be signed for a single season ahead of Sergio Perez joining in 2014.

“Sergio was flavour of the month last week for the Ferrari drive; now it’s me,” Webber said at the Mugello test on Tuesday.

“I’m focusing 100 per cent on this season and doing the best job for myself and Red Bull Racing. I’m not putting any energy into anything else.”

Italian-language reporters also quote Webber as saying: “There’s a whole season ahead of us before we need to think about the future.

“One day the talk is about Jenson (Button joining Ferrari), then it’s Sergio, now it’s me. I haven’t signed anything.”

“My focus is on this team (Red Bull); we’ve had a good start to the season, we’re only four races down and the road is very, very, very long before we start talking about the future.”

As for the closely-contested 2012 championship, Webber added: “The grid is very close together.

“Sebastian (Vettel) had a weekend without problems in Bahrain and won but he didn’t dominate, and that’s the same for everyone.

“No one will be dominant in the first half of the season, so to be third at the start of the European season is not bad,” he said.

Tuesday was a new experience for many F1 regulars; a rare in-season test on an unfamiliar track.

Some teams wanted the three-day session to take place at Barcelona, saving money ahead of the Spanish grand prix at the same venue, but Ferrari pushed hard – reportedly even waiving the circuit rental fees – for its circuit in Tuscany to get the nod.

The day did not start well weather-wise, but the spectators – reportedly 25,000, and visibly more than in Bahrain last weekend – came nonetheless.

“This is my first time here,” Sebastian Vettel, whose teammate Mark Webber kicked off proceedings for Red Bull on Tuesday, told Auto Motor und Sport.

Australian Webber, second fastest after the first morning behind crowd favourite Fernando Alonso, has been here before.

“I once did a sports car race here,” he said.

“It’s a bit too fast (for F1).”

Indeed, of the grand prix circuits, only Monza is faster. Nico Rosberg, in the Mercedes, gave Mugello a big thumbs up.

“1 to 10, I’d give it 8.5,” the German grinned.

It is an important test for Ferrari, but – contrary to earlier rumours – there is no ‘B’ car.

Alonso told La Gazzetta dello Sport that Mugello and then Barcelona next weekend will not make or break Ferrari’s championship.

“We need to catch up race after race,” said the Spaniard. “If we do poorly in Barcelona, it doesn’t mean our season is over.”

Jerome d’Ambrosio has revealed he could drive one of the Lotus cars during Friday morning practice sessions at some point in 2012.

The former Virgin driver, who is managed by Lotus boss Eric Boullier’s Gravity company, was appointed as the team’s third and reserve driver for this year.

But, until now, it was not known if the role would involve Friday morning practice duties.

Asked by the La Libre newspaper when he will be seen on the grid once again, Belgian d’Ambrosio answered: “I hope in 2013.”

He will get his 2013 campaign up and running on Tuesday, when he gets the chance to drive Lotus’ current E20 for the first time at the Mugello test.

The 26-year-old said on Monday: “I will try to show what I can do every time I have the opportunity, not only tomorrow but also during the Friday morning tests that I can participate in.”

D’Ambrosio admitted he would rather be racing this year, but insists that his role at Lotus is a good stepping stone.

“I’m not complaining,” he said. “I remain convinced that my decision to become a reserve driver with a big team was the best thing for me.”

And he insisted he is not jealous of the similarly-aged Romain Grosjean, who took the E20 to the podium in Bahrain recently.

“Honestly not,” said d’Ambrosio. “I would be a fool to think that if Romain had crashed twice more I would replace him in Barcelona.

“Instead, what Grosjean has done confirms that young guys can be trusted. I am glad to see him succeed.

“I don’t come to grands prix hoping one of my teammates is hurt. I’m here to learn, not to laugh.”

He thinks Lotus could win a race in 2012.

“It’s possible, yes,” said d’Ambrosio. “The E20 works well when it’s hot, degrading the tyres not too much.

“In Bahrain, we had the best car in the race. We cannot afford to miss opportunities.”

HRT has announced it will sit out next week’s rare in-season formula one test at Mugello.

For the first time in years, the sport has relaxed slightly its strict testing ban in order to give teams the chance to run between grands prix.

The three-day session at Ferrari’s Italian circuit will begin next Tuesday, during the three-week gap between Bahrain and Spain.

Struggling backmarkers HRT, however, will not be there, opting instead to be “completely focused” on relocating to its new Caja Magica headquarters in Madrid.

Every other team will be at Mugello, 30 kilometres from Florence — the first in-season test for four years.

26 drivers will be in action, as will a lot of update packages following F1′s return from the hectic ‘flyaway’ season.

Red Bull, Ferrari, Mercedes, Sauber, Marussia and Toro Rosso will use their regular race drivers.

Running regular racers and a tester will be Lotus (Jerome d’Ambrosio), Williams (Valtteri Bottas) and Force India (Jules Bianchi).

Germany’s Auto Motor und Sport said Caterham is “using the opportunity to earn some money” by accepting the sponsorship of the Venezuelan Rodolfo Gonzalez.

McLaren has scheduled to run its testers Oliver Turvey and Gary Paffett, although Lewis Hamilton has indicated he might gatecrash the programme in order to help solve the MP4-27′s newfound tyre problems.

Well-known Brazilian commentator Reginaldo Leme has defended Felipe Massa, amid the Ferrari driver’s career crisis.

Massa’s Ferrari seat hangs in the balance, and according to his boss Stefano Domenicali, he will have to improve in order to simply stay on the F1 grid with any team next year.

But Leme has pointed the finger of blame at Ferrari’s struggling F2012 car.

“It is very difficult to give an explanation for any driver’s bad phase,” Leme acknowledged on the Redacao Sportv programme.

“The car is very bad. The fact that Alonso is always scoring (points) just shows that the Spaniard is the best driver of this generation.

“No other driver, however good, could get anything out of that car.

“I think that’s what’s happening with Massa,” said Leme.

Massa will drive Ferrari’s heavily updated Barcelona-spec car at the Mugello test next Wednesday, while Alonso will drive on Tuesday and Thursday.

Turning his attention to the 2012 championship, meanwhile, Reginaldo Leme said consistency is more important than ever before, with four separate teams having won races so far.

“Look at Webber — he has been fourth four times and is third in the championship. Hamilton has been third three times and is right in contention.”

Bernie Ecclestone on Sunday confirmed reports France is definitely heading back to the F1 calendar.

Reports earlier this weekend said authorities had “finally agreed” a figure for the sanctioning fee with F1 chief executive Bernie Ecclestone.

It is expected that the Ecclestone-owned Paul Ricard will share an annually alternating grand prix date with Belgium’s Spa-Francorchamps, beginning in 2013.

“Yes,” the 81-year-old Briton told French daily L’Equipe in the Bahrain paddock on Sunday.

“The deal is done,” said Ecclestone.

“We agreed the financial terms with the sports minister David Douillet, in my office on Tuesday.

“We are still discussing a few things about money: ‘You give me this, I want that’,” he added.

“But, for me, there is no doubt, we will sign it now,” said Ecclestone.

He said the outcome of the forthcoming presidential elections in France will not spoil the deal.

“Whatever happens, I don’t care,” said Ecclestone. “That’s a local issue that doesn’t concern me.”

With F1 currently scheduled to arrive en masse in Bahrain next week, a crisis surrounding the possible cancellation of the island Kingdom’s race is continuing to deepen.

The teams have now denied Bernie Ecclestone’s claim that they can simply choose to skip the event.

“That would not be possible,” said a statement issued by the teams association FOTA. “Teams are unable to cancel (a) grand prix.”

Bahrain, meanwhile, stepped up its campaign, accusing some of deploying “scare-mongering tactics” designed to force the race’s cancellation.

The race organisers released a report conducted by Lotus, following the Enstone based team’s recent reconnaissance mission to Bahrain.

“We came away from Bahrain feeling a lot more confident that everything is in hand,” Lotus is quoted as having reported.

The team, however, reacted angrily, accusing the organisers of having released a “confidential” document.

“Lotus F1 Team is one of 12 contestants of the … world championship and we would never try to substitute ourselves for the FIA”, said the Enstone based team.

Surmised Times correspondent Kevin Eason on Twitter: “(It’s) getting messy…”

At the same time, F1 chief executive Ecclestone became fully immersed in the political situation on Tuesday, reporteding personally phoning Bahrain’s crown prince to express concern about the jailed hunger striker.

An Amnesty International report published this week had called for Abdulhadi Al-Khawaja’s release, amid claims he is now close to death and being force-fed.

But the Bahrain government, through its information affairs authority, insisted that only police and rioters are being injured in “infrequent and remote clashes”.

Also weighing into the argument was Sir Jackie Stewart, the eloquent triple world champion, who said: “I would go.

“The commercial rights holder has sold a package, at a price, and it is part of the constructors’ agreement that they attend the races that have been published,” he told the Guardian.

“As a team owner I would have to honour my agreement both orally and legally.”

Whatever happens, the Bahrain saga – stretching back now over a year – is not good news for the future of the island Kingdom’s calendar spot.

“Maybe we wouldn’t renew it (the contract),” Ecclestone admitted to the BBC. “We’ll have to look and see.”

McLaren is not yet ready to roll out a Mercedes-style ‘F-duct’ to complement its highly competitive 2012 car.

Despite Mercedes struggling with tyres in the actual races so far, the W03 is a standout qualifying performer, thanks in part to the so-nicknamed front and rear ‘super-DRS’ system.

Red Bull, Lotus and perhaps even Ferrari are threatening to protest, but until now McLaren – with arguably the dominant package of the 2012 season so far – has stayed out of the argument.

“We don’t have a strong view one way or the other,” technical director Paddy Lowe confirmed during the regular Vodafone media teleconference on Tuesday.

The F-duct will remain a hot topic in China this weekend, with Lotus’ technical boss James Allison believed to be armed with two new arguments against its legality.

It was thought McLaren was quite advanced with its own version of the system.

But Lowe revealed: “Until we’ve got clarity it’s difficult for us to commit a huge about of effort in that direction. So that’s where we are at the moment.”

He steered away from suggestions Mercedes, including boss Ross Brawn, have flouted the “spirit” of the recent F-duct ban.

“There’s no such thing as the spirit of the rules,” insisted Lowe, admitting that if there was a ‘spirit’ of the DRS rule, the Mercedes system is “definitely” in breach.

“The debate around whether they can keep that system on the car is not about whether it is in that spirit or not, it’s about whether the text of the regulations means they can’t,” he explained.