Reports in the Independent are claiming Kagawa could make a dramatic return to former club Borussia Dortmund, with Serbian defender Nevan Subotic moving in the opposite direction.
Kagawa has fallen further down the pecking order under new boss David Moyes and it is believed the Japanese playmaker could leave Old Trafford as early as January.
Dortmund manager Jurgen Klopp has previously spoken of his dismay at the treatment of Kagawa, while the player himself has admitted he hopes his affiliation with the German club isn't over.
Having joined United in 2012 for £17million, the midfielder has struggled to nail down a starting berth, and it is believed any potential return to the Bundesliga hinges on a deal for Subotic.
The Serbian international centre-back, 24, has already amassed 36 national caps, as well as establishing himself as one of the German league's finest defenders.
It is believed that following United's worst start to a Premier League season in 24 years, and the fact that Rio Ferdinand approaches the latter stages of his career, Moyes wishes to add to his current centre-back options.
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