One element of changes made to the Monte Carlo circuit is a tweak to the speed bumps at the sequence of corners before Rascasse.

As well as a new kerb running parallel to the track, the reshaped kerb on the inside of the left-hander has raised eyebrows among drivers, who fear it could cause trouble.

Asked for his views on it, GPDA director Grosjean said: "I don't really know why [they've done it] – maybe for the Porsche! But the bigger yellow thing – don't touch it when you are in an F1 car!

"It looks like a taking off ramp. If you clip your front wing, it could take it [off] because you've made a small mistake and it will fly you straight into the wall.

"Before, there was a big one [kerb] there, and taking it you were losing time anyway, so I was a bit surprised to see that."

Perez thinks there is no need for such a big kerb on the inside of that corner, and reckons that cars will easily be launched if they hit it.

"It is far too big," he said. "I don't think there is a need to have such a big kerb.

"I think the one we had before was big enough and if you hit it it will send you to the wall. So I think this one will probably send you to the grandstand."