The former Arsenal striker's four-year deal at United ends in 2016, but the 29-year-old admits that he could be tempted to extend his stay with Sir Alex Ferguson's team, perhaps even until he calls time on his career.
"The coming years it's Manchester United. And maybe longer. United would be my last club," he told Voetbal International.
"You have a number of clubs in Europe where older players can find it good, where they are valued. You used to have that at Juventus and AC Milan, Manchester United today is a good example. So who knows how long I stay at the club.
"I have every day at United a new challenge. My development is an on-going process. That gets an extra boost when you are surrounded by new coaches and teammates, all with their own ideas, in a totally new environment."