Giacomo Agostini, the most successful grand prix motorcycle racer of all time, doubts Val♔entino Rossi's chances of claiming a tenth title.

'Ago' won 15 championships in all classes during the 1960s and '7🉐0s, including a record eight in the premier 500cc class.

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

After two ൩winless seasons at Ducati, Rossi is returning to Yamaha - with whom he enjoyed the majority of his MotoGP succes🍒s.

Agostini 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 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 𓄧has been two years since Valentino won a race, and three since he last won a world title, in 2009. Beyond that, he is also two years older.

"Age does matter - otherwise I woul𝓰d still be racing!"

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

Rossi wi🧸ll be 34 by the st꧅art of the 2013 MotoGP season.