At Casemiro's age, I don’t think he should be collecting such an amount of money at Manchester United even Mo Salah who is the main man for Liverpool had a tough time getting a new contract with Liverpool because of his age. I think the Saudi Pro League will be the perfect fit for Casemiro where he can play in a less competitive environment and still maintain his huge wages. And as for Marcus Rashford, Manchester United need to cut ties with him to be able to get rid of his high wage.
Salah has been with Liverpool for years since 2017 and because of his loyalty, he has earn much more money because of his commitment, this is why he has continued to earn better money which is fair in my opinion. If Casemiro is still with his parent club Real Madrid like the way Salah is with Liverpool, I would have justified his reason of huge wages but earning the same amount of energy in a new in new club is nothing but a financial mistake.
Let him leave Manchester United, if he get half of what he is earning now is going to be through prayers because basically he hasn't accomplished anything ever since he moved to that club, not individually or as a team but look at Salah, his contributions to Liverpool can't be match by any old player in the Premier League right now and he deserves pay rise no matter how the team try to manipulate his weekly wages, been a top scorer isn't easy to get.