The 29-year-old has been little short of a revelation since his £24 million summer switch from Arsenal, netting 23 goals in 38 appearances to fire the Red Devils to the summit of the Premier League.
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"For the coming years, it's Manchester United. And maybe longer. United would be my last top club," he told Voetball International.
"I have every day at United a new challenge. My development is an ongoing process. That gets an extra boost when you are surrounded by new coaches and team-mates, all with their own ideas, in a totally new environment."
The former Arsenal talisman went on to laud the club for valuing experience, with 38-year-old Paul Scholes and 39-year-old Ryan Giggs lining up alongside the Dutchman on a regular basis.
"You have a number of clubs in Europe where older players can find it good, where they are valued," he added.
"You used to have that at Juventus and AC Milan. Manchester United today is a good example."