Brazilian GP: Jenson Button says he has nothing to prove in F1

The 2009 world champion's future remains in doubt amid speculation that Fernando Alonso will join Mclaren for next year, and Button says his performance shows that he is still driving, and racing, as well as ever.

"I feel I'm doing a pretty good job at the moment," he said. "I've got nothing to prove and this is what I've done for 15 years.

"I'll always do my best and sometimes it isn't enough but today it was.

"I think I've had 'it' since I was 20 years old, [and] I think my experience showed today.

"I'm really happy with P4 - you always want more to challenge for the podium - and we thought we were sort of playing with the Williams at one point but it wasn't the case.

"I enjoyed the race, a great battle with Kimi and to beat both Red Bulls, both Ferraris and a Williams is not a bad day's work.

"That's all I can do right now, go out there and enjoy my racing and I loved it out there.

"You have good days and you have bad days when you're in the situation I am [in], in terms of mentally, but I don't think any of the days on the circuit have been negative, they've always been positive so I'm happy."

While Button refused to be drawn into discussing his future, he did admit that he does not want to stop.

"I'm not ready to stop racing, no," he said. "I'm here to race, do the best job I can which is what I try and do every weekend.

"Sometimes it doesn't work out but most of the time it does.

"All you've got to do is drive the car as fast as you can and carry yourself as well as you can.

"That's all you can do and the rest isn't in your hands."