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Movistar Yamaha MotoGP's Italian rider Valentino Rossi waves to his supporters before the Moto GP race of the San Marino MotoGP, in Misano Adriatico on September 13, 2015. AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)

Movistar Yamaha MotoGP's Italian rider  Valentino Rossi waves to his supporters before the Moto GP race of the San Marino MotoGP, in Misano Adriatico on September 13, 2015.  AFP PHOTO / ALBERTO PIZZOLI        (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)

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Movistar Yamaha MotoGP's rider Italian Valentino Rossi supporters waves flags prior the start of the MotoGP race of the San Marino Grand Prix at the Marco Simoncelli Circuit in Misano on September 9, 2018. (Photo by Tiziana FABI / AFP) (Photo credit should read TIZIANA FABI/AFP/Getty Images)

Movistar Yamaha MotoGP's rider Italian Valentino Rossi supporters waves flags prior the start of the MotoGP race of the San Marino Grand Prix at the Marco Simoncelli Circuit in Misano on September 9, 2018. (Photo by Tiziana FABI / AFP)        (Photo credit should read TIZIANA FABI/AFP/Getty Images)

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Movistar Yamaha MotoGP's Italian rider Valentino Rossi gestures before the free practice session of the San Marino Moto GP Grand Prix race at the Marco Simoncelli Circuit in Misano September 7, 2018. (Photo by Tiziana FABI / AFP) (Photo credit should read TIZIANA FABI/AFP/Getty Images)

Movistar Yamaha MotoGP's Italian rider Valentino Rossi gestures before the free practice session of the San Marino Moto GP Grand Prix race at the Marco Simoncelli Circuit in Misano September 7, 2018. (Photo by Tiziana FABI / AFP)        (Photo credit should read TIZIANA FABI/AFP/Getty Images)