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Manchester United doesn't care about Jadon Sancho, so in my opinion I'd say Jadon Sancho should forget about getting revenge against Manchester United by wanting to leave Manchester United as a free agent and focus on joining another club in the top 5 European leagues so that he can revive his football career. Jadon Sancho's plan is to remain at Manchester United so that he can continue earning his big wage and nothing else.
What Jadon Sancho needs to do is prove himself capable of performing better at another club and stop feeding the haters who aim to pit him against the club. My point is no matter how bad the club decision regarding him may be, he must still be able to accept it because his quality doesn’t meet the coach standards. There are many Manchester United players who will be leave, starting with Garnacho and Hojlund. The career journey is still long, and they must continue to upgrade their skills at whatever club they are placed.