The defensive midfielder, 29, joined Ajax as a nine-year-old before making his debut for the club at the age of 17. He went on to become a key player for the Dutch giants, before earning a move to Hamburg in 2006. Now regarded as one of the top holding midfield players in the world, de Jong has become an integral part of the AC Milan side as well as with the Netherlands national team.
Whilst he's appeared to be settled at the San Siro, speculation has been swirling over his the future of the former Manchester City man, with new United boss Louis van Gaal reportedly interested in bringing de Jong back to the Premier League after the World Cup. After all, he's a star player for van Gaal's Holland side, even if he's currently out injured.
United have been strongly linked with a swoop for de Jong, but Milan have already rejected an enquiry for their midfield star - from neighbours Inter.
Walter Mazzarri's side may be looking to add a holding midfield player this summer and had lined up the Rossoneri midfield dynamo to become one of the few players to make the switch between the red and blue halves of Milan. However, Pippo Inzaghi's men have totally turned down the suggestion of de Jong leaving - which could damage United's hopes of landing him this summer.
Yet given how terrible it would be for Milan to sell one of their key players to their biggest rivals, it may simply have been a case of turning down the interest to prevent them getting stronger. If that's the case, then United still have a chance of snapping up de Jong - if they can make a big enough offer this summer.