According to the London Evening Standard, as reported by the Express, Jose Mourinho has lost his patience with the Frenchman, amid growing uncertainty about the forward's future.
Although United have insisted the midfielder is not for sale following reports he may be open to another move away from Old Trafford, the club may decide to cash in on him in the year ahead if he continues to be unhappy in Manchester. However, despite being tempted by a new challenge, the defender explained that it wasn't easy for him to leave a club like Bayern Munich.
The Red Devils re-signed the World Cup winning superstar in the summer of 2016 in the club's record fee of about £89 million from Juventus.
The German defender has proven himself as a world-class player in the past few years and Mourinho was believed to be keen on bringing him to Old Trafford.
"I called Jose Mourinho, I told him that his interest was an honor for me and thanked him for trying so hard for me".
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He told the Bild that he had "enquiries" from Man United and PSG but opted to remain in Germany because everything was "in place".
"As a fan, honestly, part of me is that no one is bigger than the club and I am not interested in people who are looking left and right". "I explained to him my reasons for not joining".
"Neville the pundit would say: he's a talented player but I want to see more consistency and leadership. Everything has to fall in place to top this club, if I do it. [Bayern Munich boss] Niko Kovac gave me the feeling that I am very important for him and the club".
One position that he desperately tried to strengthen was the centre-back position.