Mark Webber has reacted with anger to suggestions that his victory in the Monaco Grand Prix came with an illegal car.

Webber's victory in the principality came despite question marks being asked about a hold in the floor of the Red Bull RB8 just ahead of the rear wheels, which some rivals felt was against the rules.

Although the car successfully passed scrutineering, and had done at every race since the holes were introduced, the FIA declared after the weekend that the holes are now illegal, forcing the team to make a change ahead of the Canadian Grand Prix this weekend.

Questioned on the topic during the Thursday press conference in Montreal however, Webber was clearly unimpressed by any suggestion that his victory in Monaco was gained with an illegal car, pointing out that there had been no issue discovered in any technical checks carried out.

"We're very optimistic on the driving side that the change won't make difference at all," he said. "You won't believe us, but we had some changes for Valencia anyway which included no hole, irrespective of the rule change. That is what we were doing.

"In relation to [allegations of] winning races with an illegal car, I'm happy to be called a lot of things and am happy to have criticism of my driving and lots of other stuff, but I won't take criticism in that respect.

"It pisses me off to be honest, because the car has passed every single technical check after the race and all of the teams that were against it didn't make a protest in Monaco. The car passed a test after Bahrain, it passed a test after Monaco and now there has been a clarification of the rules.

"The rule now is different. We had a car that was legal for the first part of the season and now that the rule has been changed we will start again."