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It seems that Amorim must change the formation that he has used for Manchester United players in the upcoming matches, because I see Mainoo really does not live in a formation like that even though he is one of the very good players at Manchester United at the moment apart from several players in the front line. Because Amorim who is new to Manchester United must try more new things in the team so he can know what is more suitable for the team at this time because I also thought that Manchester United could win at home when hosting Nottingham Forest. But in fact they lost at home.
I don't think the style of formation Amorim uses is the problem. His 3-4-3 formation works for him. We saw him use the same formation at Sporting CP and he flourished with it, even in the Champions League too where he used such similar formation to win Manchester City. I think it's the players that needs to adjust to the coach tactical strategy and formation. Manchester players are so weak and lazy, most players don't have the stamina to play in such a rigorous formation. For Amorim to effectively implement this formation, he would have to offload the current team and buy new players.
True, Ruben Amorim does not have to change his strategy and coaching style, because the ones who should adapt are the Manchester United players themselves. The 3-4-2-1 formation is Rubem Amorim main choice, and it seems that the coach will continue to maintain this formation as part of his identity. If the players fail to adapt to the new scheme, then they will automatically be eliminated from the Manchester United main squad in the future.
But for this season, it seems that Ruben Amorim will continue to utilize all available players, most likely the management will ignore the January transfer market and will only do a warehouse clearance in the upcoming summer transfer market.