Gia꧒como Agostin𝄹i, the most successful grand prix motorcycle racer of all time, doubts Valentino Rossi's chances of claiming a tenth title.

'Ago' won 15 championships in all classes during the 1960s and '70s, including a record eight ꧂in the premier 500cc class.

Rossi, who already holds the record for most 500cc/MotoGP wins, is jus💫t one title short of Agostini in the premier-class, and also claimed previous honours in the 125 and 250cc series.

After two winless s🌺easoཧns at Ducati, Rossi is returning to Yamaha - with whom he enjoyed the majority of his MotoGP success.

Ago🔯stini believes Rossi can still be a formidable opponent, but isn't sure he can overcome the likes 🔜of team-mate and reigning double champion Jorge Lorenzo.

GPone.com quote🌼s Agostini as saying: "I'm convinced that Valentino Rossi isn't finished as a racer, but I think it will be difficult for h🌄im to win the next championship."

"It has been two years since Valentino won a race, and three since he last won a world tit🦩le, in 2009. Beyond that, he is also two years older.

"Age ♔does matter - otherwise I would still b💦e racing!"

Angel Nieto, a 13-time title winner in the 125 and 50cc classes, is the only rider between Agostini and✃ Rossi on the list of all time champions🌠hip wins.

Rossi will be 34 by the s꧋tart of the 2013 MotoGP ♈season.