Cal Crutchlow has been ruled out of this weekend's Argentina MotoGP round due to the hand injuries sustained in Austin.

The Ducati Team rider had initially been diagnosed with a dislocated right little finger, but further checks at a specialised centre in San Diego also revealed a tiny fracture of the finger and as a result it was decided that he should undergo a small operation to insert a stabilising pin.

Crutchlow, one of the few who already knows the Termas de Rio Hondo track after taking part in two days of testing last year, hoped to recover in time for the Argentinean race. However continuing intense pain in his right hand, which prevents him from using the front brake correctly, has forced him to abandon. He will now return to England to continue treatment and try and get ready for Jerez.

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"I am very sad to let the team down like this because I was really looking forward to racing in Argentina," said Crutchlow. "On Tuesday I had some scans on my hand and we saw that my finger was still dislocated from the crash and also broken so Dr. Chao decided to put a pin in to stabilise it.

"Unfortunately I'm still feeling too much pain in my right hand, my knuckles are the most painful part and I'm not in condition to race this weekend. Now I'm going back to the UK to continue treatment and try and get ready for the race at Jerez."

Cructhlow also had some fluid in his forearm removed, a legacy of last year's Silverstone accident.

Ducati test rider Michele Pirro will take the Englishman's place alongside Andrea Dovizioso, who claimed Ducati's first podium since 2012 at Austin.