"Obviously the injuries I've had over the last few years have been a concern for me, but it's something I've just had to deal with," he told ManUtd.com.
"I hope that going forward I can stay as fit as possible and keep playing games for the club - I'm certainly doing everything I possibly can [to do that].
"Injuries are the most frustrating part of being a footballer, but it's not something I think about every day. You just have to get on with things and do the best you can to stay fit and the club's medical team do the best they can to help me."