The current trend for MotoGP factories to seek young stars from the Moto2 and even Moto3 classes is 'logical' to Valentino Rossi.

Moto3 title leader Jack Miller is expected to jump directly to MotoGP next year on a production Honda, with fellow teenager and race winning Moto2 rookie Maverick Vinales tipped to sign for the returning Factory Suzuki squad.

Asked if the quest to sign such riders was an indication that factories believe the current crop of riders cannot beat Marc Marquez, the seven time MotoGP champion replied:

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"No, I think it is logical. Normal. Also, all the official Honda and Yamaha teams have re-signed their riders for another two seasons.

"For me it is good and normal that factories try to find the younger generation because after the next two years maybe I will stop. Jorge and Dani will be older but have a lot of years in front.

"I think it is normal that they try to find the new talent from Moto2 and also sometimes Moto3, in the case of Miller. But this is good for motorcycle racing."

35-year-old Rossi was also asked if he felt the younger riders were fitter than him at the end of the races.

"I think I'm very well prepared [physically] and generally feel good," said Rossi before revealing a leg issue in last Sunday's race. "At Indy I had a problem with the left leg. This happened to me especially since the injury to my right leg [2010]. For some reason I have a problem. I think because I am old a little bit! But also because I have a small problem with the knee.

"In the last part of the race I had some pain, but I know Indy is a very critical race track, especially for the leg for me personally.

"I think also for Jorge and Marc it was difficult at the end of the race because the weather was very hot and humid. So I think mainly they were faster than me because they were better with the bike. But I will work to fix the problem."