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There are so many factors that influence. Transfers of players from outside the EPL do not always make the best contribution. This is because of the differences in the characters playing each league. They could not adjust to the fast tempo of the EPL. So I think the player transfers that Ten Hag made don't seem to be effective either. His project failed plus many players were injured. Man United's suffering is complete. But 1 trophy seems to be able to make the management change their minds.
Most players from outside the EPL will have difficulty adapting to the game in the EPL which relies on speed and physical strength, some top players have failed to shine in the EPL due to having difficulty adapting to the style of play there. Radamel Falcao, Juan Cuadrado and De Maria are some of the players who failed to shine in the EPL. Manchester United in Ten Hag hands was not very successful even though they managed to win the FA Cup trophy, but management still has hope for him to continue the project for next season. I think this is the last chance given by the Club management, Ten Hag must repay the trust placed in him with achievements if he wants his position to remain safe.
Yea, English football is more of muscular football, so players from outside the league adapting to the pattern isn't that easy, it requires a player that is not selective when it comes to team plan and decision to survive in English football clubs, I have wat have watched some players make decision to leave their clubs, may see it as if they just want to leave because of other things not knowing that they can no longer adapt to the situation on ground, the players you mentioned are not fit for English premiership football, in the aspect of Manchester United not being good under Ten hag as you said although i wouldn't say you are wrong but i will argue you to an extent, No doubt that it wasnt easy for them in the FA cup finals but their performance in that final that lead to their victory wouldn't be forgotten so soon and that is understand the supervisor and mentorship of Ten Hag so he deserve accolades for that, we never can tell what he is going through presently in the team, though anything that happens in a team is to be blame on the manager but kets also undeetand that players can decide to frustrate their coach, in Ten hag case it might also be possible.