Fans, teams and bosses had been desperately hoping the promising 19-year-old would recover from his ordeal after being flown to a Florence facility for emergency treatment following a collision with Japan's Ayumu Sasaki at the Mugello Grand Prix in Italy.

Medics attended to the teenager on the track before a medical helicopter transfered him to the Careggi Hospital, where he was described as being in a critical condition.

"Despite the best efforts of circuit medical staff and all those subsequently attending to the Swiss rider, the hospital has announced that Dupasquier has sadly succumbed to his injuries," MotoGp announced on Sunday.