Marlboro Ducati's Nicky Hayden has been forced to withdraw from testing the 2012 1000cc GP12 at Valencia today after scans showed he has broken the scaphoid and radius bones in his right wrist.

The 2006 MotoGP World Champion had been due to evaluate the new aluminium frame today and tomorrow but injury he sustained in Sunday's first-corner melee means he may have to have surgery and will not ride.

“This morning I put my leathers on to go out, but I was still pretty uncomfortable. I went to the mobile clinic for a painkiller, and when I got there, the doctor said it would be better to get a proper scan. They set me up for an MRI at a local clinic, and the fractures were pretty clear," said Hayden.

"After talking to the doctor and my physiotherapist, we decided not to ride, even though we do have some stuff we’d like to test for Ducati. The scaphoid is a unique bone, and if you mess with it, it can take a long time to heal because it gets limited blood supply. I just have to be smart and watch the test. We’ll get some more opinions and decide whether to get surgery.”