Ten Kate Honda's Ryuichi Kiyonari has been forced to pull out of the World Superbike final round at Portimao as the collarbone he broke at Magny-Cours is proving too painful.

The Japanese former British Superbike Champion originally broke the bone in testing last season and the crash in France injured it again, causing him to withdraw from this weekend's action.

"You can imagine that I am very disappointed to miss out on this final race of the season. I am especially sorry for my team, who have worked so hard this season," said Kiyonari.

"I would also like to apologise to Honda and the sponsors of the team. I wanted to race but, after I spoke with doctors and the team, we decided that it was not possible. It’s a shame to end the season this way but now I want to get my shoulder fixed so that I am fit again for next year."