A Spanish newspaper is reporting Pirelli blatantly broke the rules by changing the construction of it's tyres at last weekend's British Grand Prix.
The race at Silverstone was controversial as four tyres exploded at high speed while other drivers suffered slow punctures and other cuts in the rubber.
"At worst, it jeopardised the lives of the drivers," Canseco said, referring to the tyre failures at the British GP that have thrown the sport into crisis.
If the claim is true it also comes just over a week after Pirelli was reprimanded for it's role in the 'testgate' scandal.
According to Marca, a new kevlar layer was added to the already steel belts inside the tyres.
This was found out when team personnel completed an inspection of the circuit after the race and found shards of kevlar in the areas where the tyre explosions occurred.
Earlier in the season several teams blocked a move by Pirelli to introduce a purely kevlar belt though it is now thought those teams will now allow such a move in the wake of the Silverstone failures.
Pirelli does deny the report however: "I can assure you that the tyres (at Silverstone) were the same construction as the ones used in Barcelona," said Director of Motorsport Paul Hembery.
Reaction and responses to the failures seen at Silverstone has begun, the young driver test set for July at the same Silverstone circuit is now to be opened up to race drivers and an additional day might be added.
Mercedes remain banned from that test, though Mercedes Director Toto Wolff did admit some concern about what the teams will be allowed to do.
"If it is a pure tyre test, I'm all for it," he told Germany's Sport Bild.
The FIA may also allow Pirelli to change their tyres with a majority vote rather than a unanimous decision.
"In the meantime," the governing body added, "the FIA has asked Pirelli for an assurance that there will be no repetition of the tyre problems at this weekend's German Grand Prix or at subsequent races."
If the safety can not be 100 per cent guaranteed at Nurburgring, it is possible some drivers may boycott the race.
"I don't think that will happen," Bernie Ecclestone told the BBC.
But McLaren team boss Martin Whitmarsh insists: "There is that danger (of boycott), if it is not certain that it is safe.
"But this is not what we want for F1. We had these problems in Indianapolis (in 2005) and it was terrible for the sport.
"This is not the time to blame anyone. We need to work together and find a solution."
Meanwhile, it is expected Pirelli will now be allowed to introduce the all-kevlar belt at the German GP this weekend.
Lotus boss Eric Bouillier said: "We would support this. Who blocked the introduction of the kevlar tyres on sporting grounds.
"Safety is the primary concern."
F1 chief executive Ecclestone confirmed: "They (Pirelli) can change them(the tyres).
"(FIA president) Jean (Todt) agreed with that and I told Pirelli."
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