MotoGP title contender Jorge Lorenzo insists he will race 'without problems' at Motegi this weekend, after hurting his shoulder in a training accident.

The Spaniard is reported to have sprained ligaments when he fell from a minibike last Saturday.

"As you may have heard, I had a small incident while I was training but I'm well, I just have a bit of pain in my left shoulder but I will race without any problems in Motegi," Lorenzo declared.

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The incident marks another potential swing in the power struggle for the 2015 MotoGP championship, which has seen momentum see-saw back and forth between Lorenzo and Yamaha team-mate Valentino Rossi.

After losing ground due to a DNF at Misano, Lorenzo struck back with his sixth win of the season at Aragon, cutting Rossi's advantage to 14 points heading into this weekend's Japanese race - the first of four remaining rounds.

"I have still great feelings from Aragon," Lorenzo said. "It was a nice victory in front of our home crowd. We were also able to achieve the World Championship Team Title for Movistar Yamaha MotoGP. The weekend was perfect and we could make up some good points compared to Valentino.

"The championship is amazing in this last part of the season but from now on we need to stay more focused if we want to keep the momentum and try to win the title. Next stop is Japan a place where I have good memories, especially from the last two years.

"Motegi is a typical stop and go circuit but for some reason I could do great races in the past even if it may be better suited for our rivals. This year we go there eager to do another great battle so hopefully we could do another nice race and try to make the championship tighter."

Rossi has not been without an injury scare of his own, falling heavily in the post-race Michelin test at Aragon, the Italian emerging a little 'beat up'.

Lorenzo has won at Motegi for the last two years.