And this summer is no exception after Metro claimed the Red Devils would push for his signing one final time with a £20 million bid for his services imminent.
Louis van Gaal is in dire need of a world class defender at the club following the high profile depatures of Rio Ferdinand and Nemanja Vidic.
Reports in Germany suggest that van Gaal, who is currently at the World Cup with Brazil, will offer Dortmund a final take it or leave it offer.
It is claimed that the German international defender is happy with Bundesliga outfit Borussia Dortmund but could be tempted away with a giant contract offer.
Real Madrid and Barcelona had previously been interested in the 25-year-old German international but their interest seems to have died.
Manchester United fans. Is Mats Hummels the man to slot into your defence and replace Vidic and Ferdinand? Let us know your thoughts below.
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