Ben Spies has been declared fit to ride in this weekend's Malaysian MotoGP, having missed last Sunday's Australian round due to a concussion in qualifying.

The Texan will nonetheless be riding in some discomfort after suffering ripped soft tissue around the rib area, as well as the knock to the head.

Spies, nearing the end of his first season at the Factory Yamaha team, qualified and finished fourth in his first MotoGP race at Sepang last year, when he was riding for Tech 3 Yamaha.

"I like Sepang," said Spies. "It's a track we visit a lot because of the off-season testing so we know it quite well. Coming into the weekend I want to be able to put in a good result, especially for Yamaha Motor Indonesia/Semakin di Depan and Petronas which are our main sponsors.

"Unfortunately I'm definitely still recovering from Phillip Island, but I'm going to give it 100% as we always do. It's frustrating but it's been a bit of a year for bad luck. We'll do the best with what we've got and see what we can achieve."

"We have to see how Ben's physical condition is," stated team director Massimo Meregalli. "Until he jumps on the bike we won't know how fit he is."

Spies wasn't the only Factory Yamaha rider to miss Phillip Island, with team-mate Jorge Lorenzo sidelined by a nasty finger injury in warm-up. The 2010 world champion is being replaced by test rider Katsuyuki Nakasuga this weekend, who will also participate in Monday's 1000cc test at the track.

"I am sorry for Jorge's crash and feel bad for his injury," commented Nakasuga, who races in the All Japan Superbike championship. "I am confident he will be back in action soon.

"Of course it is impossible to replace the 2010 World Champion but I will do my best to get a good result for Yamaha and the fans this weekend. This does not just mean a good position but actually also good feedback to help develop the new 1000cc machine for next year. Although next year's YZR-M1 is very different, I will try to get good ideas for next year and the future.

"I am a little nervous as a Yamaha Factory rider but luckily Sepang is a track I know pretty well. It's a 'stop & go' style track that I like very much. I will give 110% of my efforts to help Yamaha Factory Racing and to deserve the role of replacing of Jorge Lorenzo".

"Our targets need to be adjusted for this round," said team manager Wilco Zeelenberg. "Normally it would be the podium but that's not necessarily realistic for Sunday. We need to see how Nakasuga-san rides, we know his best lap time is 2'02.4 seconds here which is not so bad.

"This will be his first Grand Prix so it will be a new experience for him. There won't be much grip to start with after the rain here so we hope he will stay steady and remember we have four practices to go. He has all the freedom to push the bike to the limit; we want him to be comfortable to race and not to treat the weekend as just a test."