Motorcycling-Rossi unsure how long he will stay in MotoGP

BERLIN, Nov 15 (Reuters) - Valentino Rossi is unsure how long he will continue riding in MotoGP, the former world champion said on Thursday.

"At the moment I really don't know how long I will stay in MotoGP," the Italian told the German magazine Auto Bild Motorsport. "A lot depends on how competitive we (Yamaha) are next year."

But Rossi, who last week hinted at a future move to Ducati, made it clear he would end his career with Yamaha.

Ducati rider Casey Stoner of Australia raced away with the title this season with Rossi finishing third, the first time he had finished outside the top two in any category since his rookie season in 1996.

(Reporting by Paul Carrel, Editing by Tony Jimenez)