Mark Webber has admitted he might not be "hungry enough" to extend his career beyond 2011.
The Australian has signed on with Red Bull for another season, with some suggesting the short contract extension is a sign of slight tension between him and the Austrian-owned team.
But Webber, 33, insists he only wanted to commit for one more year.
"I am taking each year as it comes now," he is quoted by Auto Bild Motorsport.
"In two years, perhaps I will not be hungry enough anymore," said Webber. "But that doesn't mean I'll end my career in 2011.