AirAsia Caterham's Moto2 rookie Josh Herrin will miss this weekend's new event in Argentina.

The American Superbike champion broke his collarbone in two places while training on a Supermoto bike at home in Georgia, USA, and underwent surgery on Monday in California.

It is the latest setback for Herrin, who has been involved in first lap accidents in both his grand prix starts so far, but would have been on a much more level playing field relative to the other riders during Moto2's fist visit to the Termas de Rio Hondo circuit.

"I was really excited to go to Argentina and I just want to say sorry to the team, sponsors and the fans that I won't be there. I wish the team all the best and I can't wait to see everyone again and get back on my bike soon," said Herrin.

The team will not replace Herrin and will therefore run only Johann Zarco this weekend.

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"The whole team is obviously thinking of Josh right now and we want him to be back on track and racing again as soon as he's fit and well," said team manager Johann Stigefelt. "Accidents do happen but it's obviously very unfortunate that he's suffered a pretty serious injury at this stage of the season. However, he's being very well looked after and I'm sure he'll be back fitter, stronger and more ready to race than ever before."