Spanish rider Dani Pedrosa will undergo surgery after the Spanish Grand Prix after being diagnosed with intermittent compression of the subclavian artery.
The condition causes numbness and lack of strength in his left arm, a problem that affected the Honda rider during the season-opening race in Qatar.
Pedrosa, who underwent surgery last October after a double fracture of his left collarbone, will have another operation after this weekend's race and will then make the most of the month available before the next race in order to recover.
In the operation, the titanium plate and screws inserted in October will be taken out of the collarbone in order to release the compression pressure.
"It's never nice to have an operation, but we've had a lot of time searching for an answer to the effects of this injury and I'm relaxed because I finally know what has happened," said Pedrosa. "Now, we are in Jerez and I want to concentrate on the race, working with my team in best possible way to prepare the grand prix.
"This race is special, the crowd is always there to give you an extra point and I hope it helps me, as always. I like the track, I've had always good results here and I face the weekend with an open mind, trying to do my best in my current condition."