World champion Tony Cairoli is to miss the Czech and Belgian GPs to let his injured arm heal, effectively ending his bid to win an eighth world championship. And Husky's Max Nagl is also out of the Czech race.

Sicilian Cairoli, who broke his arm in a spill in the Italian GP at Maggiora, has ridden in pain since then but the arm is not healing. Today he's taken the tough decision to miss the next two rounds, despite being second in the series 41 points behind Romain Febvre.

Husky man Nagl, who led the series until breaking his leg in a German GP spill, is still fourth in the series and has started riding again. But he has also announced he won't be fit for the Czech race.

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It means that it is highly likely there will be a new world champion - either Romain Febvre or Gautier Paulin. Yamaha man Febvre has a 66-point lead over fellow countryman Paulin with six rounds remaining. If Febvre wins, he'll be the first rookie to take the title since Cairoli in 2009.

"It's not been fun to race with an injury and not being able to fight for victory, although I tried to," said Cairoli. "What I regret most is having to stop. Unfortunately, injuries are part of our sport and we can not help it. I will try to recover as soon as possible and hope to get back in the saddle."