Seven-time F1 champion Michael Schumacher has admitted that the battle for the 2009 drivers title is still all to play for heading into the final two rounds of the season, and has thrown his weight behind outsider Sebastian Vettel to lift the crown.

Jenson Button heads to Interlagos this weekend leading the standings by 14 points from Brawn team-mate Rubens Barrichello, with Red Bull ace Vettel two points further back following his dominant success in Japan.

While that leaves Button as over-whelming favourite to secure his maiden title, Schumacher warned that anything could still happen in Brazil and Abu Dhabi and urged Vettel not to give up as he looks to overhaul Button in the title race.

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"This F1 season turned out to be extremely attractive again, and as probably all motorsport fans I am looking forward to seeing what will be happening in the last two races," he wrote on his official website. "Both championships are still open, and for me it is obviously important to see how the constructor's championship will end - of course I wish for our guys to defend their third position.

"I think it helps to think of a fact which I was always sticking to during my career: It is not over until it is over; you have to fight until the end. At Ferrari, we live that experience very successfully since many years, and I am convinced it will be like this again this time.

"Sebastian as well will probably share this view because he still has the chance to win the title. This alone is already a big success. I am sure he will make everything possible to show a good performance in the next two races. Mathematically everything is still possible, and I will keep my fingers crossed for him."