By Alan Baldwin AUSTIN, Texas (Reuters) -McLaren boss Zak Brown warned on Friday of "massive consequences" if champions Red Bull were found to have breached Formula One rules on adjusting car set-ups during closed 'parc ferme' conditions.

AUSTIN, Texas — McLaren Formula One boss Zak Brown wants the FIA to conduct a “very thorough investigation” to ensure Red Bull hasn’t breached parc fermé rules with its car in 2024, warning there should be “massive consequences” if it has.

Formula One champions Red Bull have made changes to their car after discussions with the governing FIA, the team said on Thursday. The news came after the FIA issued a statement in response to concern from some teams about a possible exploitation of rules restricting work on a car between the start of qualifying and the race.

The Milton Keynes-based squad has been at the centre of attention this weekend after it emerged the FIA was ramping up protocols to stop teams adjusting their front bib clearance

McLaren's Zak Brown has said aspects of Red Bull's explanation of its bib ride height adjustment device "don't stack

Red Bull Racing reportedly made sure it could not use the much-discussed 'trick' on the floor of the RB20 even before the Singapore Grand Prix following a warning from the FIA. The Austrian Formula 1 team was reportedly reminded after qualifying that its use was not allowed under the parc fermé rules.

The FIA has been asked to dig deeper to be sure that Red Bull did not break F1’s parc ferme rules