Jenson Button faces an uncertain future

"I have been studying Michael very closely and I honestly feel he could pack it all in at the end of the season," Hill told The Sun newspaper.

"Michael has been used to having his achievements cheered so the boos he received in Austria and in subsequent races must make him think 'what's the point in carrying on?'

"Michael's entire body language suggests he's not getting the same kind of enjoyment from winning as he used to," said Hill.

"While Ferrari are the current dominant force, there is no guarantee Michael will be so competitive next season so he may well feel it's best to bow out while at the very top."

As preparations continued for Sunday's British Grand Prix at Silverstone, Hill also warned Renault that they will be getting rid of a potential world champion if they ditch Jenson Button.

Despite an impressive season Button is expected to lose his position, with test driver Fernando Alonso taking over.

Hill, who won the 1996 world championship in a Renault-powered Williams, thinks that would be a big mistake.

"If they were going to replace Jenson with a proven race winner then I could understand the move," he said.