I still can't say for sure that will happen, but Mount has had a difficult time with Chelsea and has been under an incompetent coach. Currently he has not shown the maximum performance we expect.
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So you assume Mason Mount did not grow well under an incompetent coach (Thomas Tuchel and Graham Potter). So I will look forward to his debut with Manchester United under coach Erik ten Hag.
But if he is still in the same situation as he was at Chelsea, then it is not Tuchel and Potter who are incompetent, but the players themselves who are not so talented.