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That's never going to happen so let's operate in reality here. Bringing the players that he needs is not just up to his "freedom". We all know that there is a lot of competition in the market and other big teams would most likely bid for those players that he wants. Another constraint is that he cannot simply throw more millions just so he could outbid others.
Basically, Erik ten Hag was able to form a good squad so that Manchester United had a good performance but unfortunately, Erik ten Hag still couldn't maintain this good performance consistently throughout the season or until the end of the season. But yes, if for example Erik ten Hag is not given the freedom to acquire or bring in new players I am sure that Erik ten Hag can still produce good results. But yes, if it's to win the Premier League title or to go further in the Champions League next season, I personally feel that Manchester United still haven't been able to achieve that success.
I would say Erik Ten Hag has been successful this season because he has been able to strengthen the bond between Manchester United's players. He managed to fix the small problems that were there within the team. Manchester United is a very stable team now. And next season Erik Ten Hag will try to make this team even stronger. Since Manchester United has not been able to win the Premier League title for a long time, they will build a strong squad to win the title next season. Erik Ten Hag is quite an experienced coach. We may see more great gameplay from Manchester United next season.
IMO, I see Ten Hag at the moment wanting what he did when he was with Ajax. most likely, Ten Hag will no longer use a formation that requires a playmaker. it could be, if Bruno will be shifted to become a winger. for now, the system that he implemented has been running according to what he wanted. one or two touches, with a quick style of play and so does the rotation of the players. well, regarding goes ups and downs, I think it's very reasonable. after all, United do not have a second coating that is as good as the core team.
Well, if in this season's transfer window Ten Hag brings in players according to the wishes and needs of his team, don't be surprised, if United will be much stronger than the previous season. for newcomers, actually all coaches want very high quality players. and, Ten Hag is looking to sign some star players. but if in the end the hunt for Kane fails, he will definitely have other options, maybe even making an mediocre player shine. for example, Rashford.
So, what's wrong if Ten Hag is given the freedom to bring in the players he wants. By the way, I am not a supporter of The Red Devils, but under Ten Hag United will gradually find their glory again. especially, if the Glazers ceased to be owners.