Valentino Rossi has pledged to help Yamaha team-mate Jorge Lorenzo 'as much as possible' in Sunday's Valencia title showdown with Marc Marquez.

Rossi was personally involved in the previous MotoGP championship showdown, losing the 2006 crown to Nicky Hayden after falling early in the race, wiping out an eight point advantage.

With Lorenzo needing Marquez to finish fourth or lower even if he wins the race, Rossi could yet have an influence on the outcome of the 2013 crown, although his own final championship position is already confirmed as fourth.

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"Usually Valencia is not one of my best tracks but I have had some good podiums there and some wins," said seven time MotoGP champion Rossi. "As always we have to try and do the maximum for the weekend.

"If I am strong enough I want to try and help Jorge as much as possible on Sunday and also to arrive on the podium."

Team director Massimo Meregalli added: "It will be important that Valentino is in good shape. We'll have to make sure that Valentino can be with the other three riders. He wants it, the team also and we are ready to close the season in the best way."

Even if Lorenzo, Rossi and Tech 3 Yamaha's Cal Crutchlow are ahead of Marquez, Honda could instruct its riders - especially team-mate Dani Pedrosa - to help Marquez into fourth.