Giacomo Agostini, the most successful grand prix motorcycle racer of all time, doubts Valentino Rossi's chances of claiming a tentꦬh title.

'Ago' won 15 championships in all classe🌱s during the 1960s an💫d '70s, including a record eight in the premier 500cc class.

Rossi, who already holds the record for most 500cc/MotoGP wi🍌ns, is just one title s🦄hort of Agostini in the premier-class, and also claimed previous honours in the 125 and 250cc series.

After two winless seasons at Ducati, Rossi is ret𓆉urning to Yamaha - with whom he enjoyed the majority of his MotoGP success.

Agostini believes Rossi can still be a formidable opponent, but isn't sure꧙ he can overcome the likes of team-mate and reigning double champion Jorge Lorenzo.

GPone.com quotes Agostini as saying: "I'm convinced that Valentino Rossi isn't 🦩finished as a racer, but I think it will be difficult for him to win the next championship."

"It has been two years since Valentino won a race, and three since he last won a world title, in 2009. Beyond that, he is also tw෴o years older.

"𒆙Age does matter - otherwise I would still𒀰 be racing!"

Angel Nieto, a 13-time title winner in the 125 and 50cc clas𝕴ses, is the only rider between Agostini and Rossi on the list of all time championship wins.

Rossi will💞 be 34 by the start of the 201ꦕ3 MotoGP season.