Well Casemiro is still a vibrant player, I won't be surprised if a club comes for him on loan or outrightly buy him despite his huge weekly wages, this Saudi guys aren't playing with you when they are coming for a player, so in the aspect of the salary I don't think any Club that really wants him would look at that, Manchester United just want to get rid of him, probably because he doesn't fall into the specification of what Amorim needs for his team, just the way he did for Rashford.
To be sincere, I almost forget about Casemiro because maybe because of injury or because Manchester United is not in good shape or because he is not more a regular starter in Manchester United team.
But there is no doubt that his performances overall have dropped completely, he is not more the Casemiro we used to know in Madrid or in his first time in Manchester United, he is not good enough to even fight to be a regular starter in Manchester United team talless of signing for a better team in the future because of his age.
Casemiro will be perfect fit for some Saudi pro League teams, he should just consider moving to any team that come for him in order to keep his football career on, or he should just retire just like other players because he can’t fit in in any big team across Europe anymore.