Williams and Michelin need to bounce back in Malaysia

Michelin - who supply Ferrari's main rivals - has been the top hot weather performer while Ferrari's Bridgestone tyres are better in the cool.

But Michelin's F1 manager Pascal Vasselon is not optimistic.

"We have had to develop tyres for these hot conditions at European circuits during the winter. This makes it hard as conditions are very different."

To make matters worse Bridgestone's technical chief Hisao Suganuma, is upbeat about his company's ability to cope with the heat.

Barrichello sounds tyre warning

"We have tested long and hard for races like Malaysia and the time has come to see if we have done our homework," he said.