There is increasing speculation that Ross Brawn could become the fall guy in the infamous Tyregate saga.

Over the years, Brawn, who is known for pushing the envelope to the very limit, from his days in Sportscars and throughout most of his F1 career with Benetton and Ferrari, has sailed close to the wind.

However, with Mercedes now (seemingly) having more Technical Directors than tea ladies, some believe that the growing row over the team's Barcelona test could give his employers the opportunity to show him the door.

Brawn has increasingly appeared to paint himself into a corner, and his admission yesterday that he approved the test could ultimately be all that Mercedes needs to dispense with his services.

"I think there's been some rumours before and nothing's happened," Brawn told reporters at the official Friday press conference, a conference that Pirelli's Paul Hembery withdrew from on the advice of the company's lawyers. "I think we should say let's wait and see what the tribunal find and then we can take it from there. It was my decision to do the test so that's a fact."

The Englishman was keen to dispense with the term 'secret', insisting that the 1,000 kilometre, three-day, test was anything but.

"There has been an unfortunate branding of the ‘secret' test," he said. "It was a private test. It wasn't a secret test. Anyone who believes you can got to Barcelona and do three days of testing, or 1000km of testing, and not have anyone become aware of it is naïve.

"It was a private test, not a secret test," he reiterated, "and sporting integrity is very, very important to us. Very important to Mercedes. And as I say I think when the facts become apparent then people can make a better judgment of the situation."

Also present at the press conference, Red Bull boss Christian Horner refused to accept that Mercedes did not benefit from the test, which is what the German manufacturer is claiming.

"With the amount of technology and with the amount of date analysis there is, you're always learning." he said. "So of course, even if you are testing a component for another supplier you are learning.

"Formula one has moved an awfully long way over the last few years to ensure fairness and equality to all of the entrants," he continued, "and I think if a team does carry out an extra 1000km with a current car then you are going to learn something."

Though not present at the FIA's press conference, elsewhere in the Montreal paddock, Lotus boss Eric Boullier was keen to share his thoughts on the matter.