Seven times Formula One champion Michael Schumacher, who has come out of retirement to sign a three-year deal with Mercedes at the age of 41, says he could stay on beyond his current contract.
Mercedes have taken over 2009 champions Brawn, run by Schumacher's friend and former Ferrari technical director Ross Brawn.
The German says it's good that Mercedes believes in him and is giving him three years to have success, but he may carry on for longer.
The German retired in 2006 after winning two titles with Benetton and five with Ferrari, with Brawn the technical director in both teams.
