Factory Yamaha's Jorge Lorenzo will not take part in this weekend's Valencia MotoGP seaoson finale as the surgery he underwent to fix the fingers he damaged at Phillip Island is not healing as fast as was initially hoped.

The Spaniard, whose second position in the title chase is safe, will again be replaced by Katsuyuki Nakasuga. He had been due to ride at Sepang and will now race at Valencia for the first time in his career. Lorenzo will, however, be in evidence at the track.

"Jorge continues to recover well from his surgery but unfortunately not quickly enough to ride to his potential this weekend. We look forward to having him with us on Saturday and Sunday to provide support for our replacement rider. The team are ready to give Nakasuga-san all the help he needs to get to grips with the Valencia circuit as quickly as possible," said team manager Wilco Zeelenberg.