The Belgium international's contract expires at the end of next season and he has been linked with a number of clubs, including Manchester United, Napoli and Barcelona.
"There has been a lot of speculation, but I can't talk about it because I don't know what is going on," he told reporters at the Allianz Arena.
"My focus is at Arsenal at the moment. There is still a lot to play for - I can't do anything about rumours.
"It is not easy, but I try to stay positive.
"Firstly, I have been injured in the last couple of weeks, but when the boss needs me, I try to play well.
"I know anything can happen, so I am happy to play when he needs me.
"From my point of view, I hope it is as much as it can be. I work hard for the team and that is the only thing that I can do."