MotoGP champion Marc Marquez says there is a 5% chance that he could also make a one-off entry in the Moto2 class at Valencia.

Undefeated in the ten races this season, Marquez is on course to wrap up his second premier-class title as early as Aragon, round 14 of 18.

The latest rumours from Spain suggested that, with the championship decided, Marquez could then aim to make modern history by racing two grand prix classes in front of his home fans at the season finale.

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"No, no, no!" replied Marquez, when quizzed about the Valencia rumours at Brno on Thursday.

"Yes, yes, yes!" interrupted Valentino Rossi. "After he has won the championship, he can make two classes for the last four or five races!"

Marquez then reiterated why he definitely wouldn't attempt to win two championship classes in the same season, as famously achieved by Freddie Spencer in 1985, but left a small possibility of a one-off race:

"No I think it is too hard. One weekend can be possible, but one season is too hard. 32 races for a rider are a lot. I heard some rumours too, but I was surprised for that. 95% it is no, but it is that 5% that you don't know!"

Winner of the 2012 Moto2 title, Marquez was later asked if - hypothetically - he felt it would be possible for him to immediately fight at the front of the 600cc field.

"I didn't think about that, but I don't think so," he said. "It's hard you know because you change the tyres... change everything. That is difficult and especially we cannot forget Moto2 has very good riders.

"They are so strong and it is impossible in one race - doesn't matter if it's Moto2, Moto3 or MotoGP - to arrive at the same level as the top guys."