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Casemiro made a blunder in their last match and that caused Manchester United to lose to Liverpool in a very shameful way. Casemiro is a top player and anyone can make mistake but in a very big competitive match like that, he wasn’t suppose to be making those silly mistakes even though no one is above making mistakes.
He was criticised a lot and he needs to perform better in his next match because it will be hard for Manchester United to thrive with this form. Casemiro may leave the club soon and that’s just natural if he does now because his time at Manchester United is not overdue. He may consider playing for another team to checkmate his performance once more there.
If the team plays badly, why is it the players' fault? Don't keep arguing that the players are wrong and can't implement the coach's strategy, wrong passes, blunders, etc. I see all of this is Ten Hag's fault who can't implement a good strategy in every match.
Just look at the beginning of Arteta becoming Arsenal coach, he was widely criticized for strategy, tactics, and timing of player substitutions so that many statements came out that Arteta should be fired. However, after that Arteta immediately made improvements so that Arsenal actually got better from season to season. This is very different from Ten Hag every time his team loses he doesn't do self-introspection with his selfishness often blaming the players. Even when his players are blamed by many people he doesn't defend them so it is very natural for the players' mentality to drop.
In addition, in my personal opinion, Casemiro is a victim of Ten Hag's system, we know that Casemiro is old, he typically plays as an anchor, but was forced to become a box-to-box midfielder, told to go up and down without the support of a capable pivot, yes, it is very natural that Casemiro made several blunders which caused them to lose badly to Liverpool.