Recently we saw a bad performance from Manchester United, especially in the game they had against Liverpool in which they lost the game with a 3-0 result and the fans of these teams started blaming while the teams especially some players because of their bad performance. Even Ten Hag is in danger in Manchester United more than any time.
Ten Hag is the problem of Manchester United as far as I am concerned. He is expected to have set the team to a standard where he can now have successful team that will be reliable just as Arteta did to Arsenal and just as Pep Guardiola did Manchester City. It is not too late to for him to change some of his pattern but it seems he can’t change because he is making a lot of mistakes in his management decisions which is affecting the team in terms of performance and the fans are not happy about that despite all the money given to him to sign new young players.
Now one of these players who couldn't have a good performance is Casemiro while he had a key role in Manchester United before but he recently said he doesn't have any problems with leaving the team.
It seems he even has an offer from Galatasaray and this won't be surprising to see him leaving the team soon.

Casimero is an old player, I think Real Madrid has used him before given him to Manchester United because his performance since joining Manchester United is not as expected from United fans; the fans hyped him so much but he is not performing to their expectations and he is causing the team some errors.
Casemiro made two errors that lead to goals which is why Ten Hag removed him from the game early, and I will expect him to leave the team in the January transfer window, and as you have said, Galatasaray showed interest in him and even if he didn’t go there he will surely get offer from Saudi Arabia.