Red Bull are under scrutiny heading into the United States Grand Prix after reports revealed that they were the team suspected of adjusting their ride height under Parc Ferme conditions.

On Wednesday ahead of the United States GP, speculation surfaced that other teams had discussed their concerns with the FIA. Now, following a report from RacingNews365, that team's identity has been revealed as Red Bull.

While the Milton Keynes-based team were not deemed to have been taking illegal action, the FIA has changed its regulations to outlaw the clever trick heading into the final six races of the season.

In response to the speculation, the FIA released a statement. “While we have not received any indication of any team employing such a system, the FIA remains vigilant in our ongoing efforts to enhance the policing of the sport," it read.

“As part of this, we have implemented procedural adjustments to ensure that front bib clearance cannot be easily modified. In some cases, this may involve the application of a seal to provide further assurance of compliance.”

This news comes at a bad time for Red Bull, who are under pressure to turn up in style at the United States GP as they await the outcome of their final major upgrade package of the year.

The reigning world champions have all but conceded the Constructors' Championship title with McLaren streaking 41 points clear after back-to-back Grand Prix victories, while Max Verstappen is under pressure from Lando Norris in the Drivers' Championship.

Despite the current momentum, Helmut Marko believes Verstappen will come out on top. "Because he is the best mentally and as a driver,” he said earlier this week. "Norris is weak at the start, and he’s not the strongest mentally.

“The pressure increases with every race because in reality, he has to win every time to catch up. Max finds it easier to defend. And with Austin and a week later in Mexico, there are now two circuits that suit him really well.”