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But yes, I don't know in how far ten Hag is involved in transfer decisions and whether he has a lot to say in the club when it comes to player transfers, but there have been some questionable decisions in the recent past.
I don't think he is entirely to blame for Manchester United's poor form. In the past they have spent millions of dollars on players like Jadon Sancho, Harry Maguire and Anthony Martial and they have never benefited from them. So, there is a long history of bad and wrong transfer policy at Manchester United. They are like Chelsea, but not as bad as Chelsea.

I don't think Erik ten Hag has a squad that can compete with his rivals. Manchester United need a lot of transfers and they have almost no chance of winning the Champions League.
I wouldn't say entirely to blame, that's always an exaggeration as a club is much bigger than a single person in any case. But he can't complain about not having enough money to buy players. He did get some players. But what I wonder is whether those players were chosen by the sporting director or whether ten Hag could also decide which player to buy and which one to skip.
Do you remember the issues that Tuchel had with Leonardo at PSG? It was because Tuchel was essentially not involved in the transfers if I remember correctly and he had to work with whatever player Leonardo decided to be the right ones for the team. That's really bad because I think a coach knows better or should know better.