A row appears to be brewing over the legality of the Red Bull RB8 as the clock ticks down to the start of the Monaco Grand Prix.

The row centres over a hole in the bodywork of the car in front of the rear wheels, which a number of rivals believe is against aerodynamic regulations.

Ferrari and McLaren are both reported to have questioned the legality of the holes, with question marks raised about whether Red Bull could be forced to change the part on both of its cars - albeit in a move that would see both Mark Webber and Sebastian Vettel lose their places on the grid.

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Speaking to Sky Sports F1 however, team boss Christian Horner said he was under no illusions that the part was legal and that no changes would be made ahead of the start.

"There was a fuss after Bahrain but it was clear that the car complied," he said. "We sought further clarification on that and are happy that the car is compliant.

"The car is the same in that area as it has been in Barcelona and Malaysia. We are comfortable the car complies with the regulations and we are not going to change it."

Commentator Martin Brundle however admitted that the issue could be one that causes a headache for Red Bull once the race is run.

"The car may well be protested," he said. "Understandably Christian is standing his ground but it may come to a stewards decision and questions could be asked. This is a serious issue."