Jenson Button 'not worried' about future

Button has struggled this season and is being pushed by 21-year-old team-mate Kevin Magnussen, who sits just a spot below the Brit in ninth in the drivers' standings.

McLaren refuse to guarantee 2009 world champion Button a seat for next season, with his contract expiring at the end of this campaign

Button, 34, said he had nothing to worry about, pointing to his record of 15 grand prix wins during his career.

"We have a good understanding. I can't comment on contractual things but I'm not worried about my future in F1 and I shouldn't be," he said.

"I'm a world champion, I've won 15 grands prix and feel I'm at the top of my game.

"I've got a really quick team-mate pushing me on and don't see why I wouldn't be here next year."