Although Red Bull and Ferrari insist they did not change their front wings, Martin Whitmarsh is adamant McLaren's rivals made alterations to pass the FIA's new tests.
McLaren have been one of the more vocal teams is questioning the legality of Red Bull and Ferrari's front wings, claiming that they flex too close to the ground.
This prompted the FIA to introduce a revised test at this weekend's Belgian GP, increasing the load placed on the wings.
Both Red Bull and Ferrari passed the new test, insisting that they did not have to make any adjustments in order to do so.
However, Whitmarsh disagrees.
"I wasn't that confident that (the problem) would be nailed, but I have to say... the wings were of a different stiffness and positional domain than they had been in previous races," the McLaren team boss told Reuters .
"I think we could all see it, and the evidence that was collected yesterday showed that, in regards to stiffness and position, the front wing endplates of those cars appear to be in a different domain."
And he's not the only rival team boss who believes that.
"I think all of us can see that what was visible in the last couple of races doesn't seem to be the case here," said Mercedes GP boss Ross Brawn, "I don't know what has happened, but it looks visually to me, to be different."
