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If they just change coaches, I don't think Man United will find their solution. What Man United needs is a major overhaul, including selling the 2 selfish players you mentioned above. As long as those 2 players are still at Man United and still be starters, then Man United will only have a monotonous rhythm that was easily broken by their opponents. Man United only needs to retain players like Garnacho, Kobbie Mainoo, Martinez, Amad Diallo, and several other potential young players, and maybe Rasmus Hojlund.
As a striker for Man United, Hojlund doesn't seem like he can make much of a contribution but I don't think it's because he doesn't have good skills but more because he rarely gets passes and support from the side or midfield.
I rarely see Manchester United's performances lately in every match, but talking about the United squad, it seems like we agree on one thing. United have changed coaches since Sir Alex Ferguson, now they are far from the Premier League trophy, the post-coaching achievements of Sir Alex Ferguson have dimmed. United's current problem for me is not with the coach, yeah from my personal perspective, but with the players. One of them, as you said, is that we agree, United will inevitably make serious changes. not just on the players, but on the club itself.
Speaking of players, it seems rumors of unhealthiness within the United squad are the main factor. some of the players mentioned in this post, have high egos and they lack discipline. It seems that United or Ten Hag need to refresh their players or discipline players who are difficult to control. Bruno and Rashford are good partners, unfortunately they are less reliable in terms of discipline. Ten Hag has tried to apply pressure, but not on Bruno. Ten Hag should be evenly distributed when giving sanctions to one of its players.
As for the other players mentioned, their performance is quite good and will probably be retained next season. talking about Hojlund, as you said. It seems like he didn't contribute much due to the lack of good supplies from his teammates, plus this player is still young. His performance will continue to improve, as he is able to adapt well and have strong bonds and chemistry with his colleagues. Well, we'll see next summer what United will do.