Coulthard doubts Villeneuve future
 |  Villeneueve has had a disappointing time with Sauber this season |
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LONDON, England -- Canadian Jacques Villeneuve could quit Formula One unless his situation at Sauber improves soon, friend and rival David Coulthard has suggested.
"Jacques is having a difficult time at Sauber. Two races in and already the media are questioning if he will keep his seat," said Coulthard.
"I know he is capable of great things but unless we see a marked improvement by Imola it wouldn't surprise me to see him walk away or be encouraged to do so," added the Red Bull driver.
The San Marino Grand Prix at Imola in Italy on April 24 is the fourth round of the season after next week's race in Bahrain.
Villeneuve, the 1997 world champion who joined Sauber this season after being dropped by BAR in 2003 and making a comeback with Renault at the end of last year, has struggled in his two races for the Swiss-based team.
The 33-year-old finished 13th in Australia, after starting fourth, and was beaten by Brazilian team mate Felipe Massa who started at the back with a far heavier fuel load. In Malaysia he skidded out.
Villeneuve's manager Craig Pollock said this week that the Canadian lacked confidence in his car.
"Jacques does not feel comfortable with the set-up. He lacks mileage and can only show 85 per cent of what he is capable of."
Briton Anthony Davidson, the BAR reserve driver, has been mooted as a possible replacement and his management have approached Sauber already.
"It would be good to have another Brit in Formula One and he is an able, fast racing driver," said Coulthard.
