Jenson Button makes his case with Brazil display

It has been widely reported that Fernando Alonso will return to McLaren under a two-year deal next season, potentially ending Button's 15-year involvement with the sport.

Alonso appears set to partner Kevin Magnussen from next season, but Button once again outperformed his younger team-mate at Interlagos on Sunday.

The 2009 world champion followed fifth place on the grid with a fourth-placed finish to move onto 106 world championship points for the season - almost double Magnussen's tally of 55.

"I think my experience showed today," the 34-year-old told Sky Sports after finishing ahead of reigning champion Sebastian Vettel in fifth and Ferrari duo and fellow former titlists Alonso and Kimi Raikkonen.

"I'm really happy with P4. You always want more - to challenge for that podium, but it wasn't the case.

"I enjoyed the race, it was a great battle with Kimi. To beat both Ferraris and a Williams, it's not a bad day's work."

Button conceded that the speculation over his future has proved testing mentally but he feels results show this has not affected his work on the track.

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

"You have good days and you have bad days when you're in the situation I am, in terms of mentally.

"But I don't think any of the days on circuit have been negative, they've always been positive.

"I'm going strong so I'm happy. Not ready to stop racing, no."