Seeing both Marcus Rashford and Casemiro earning such a massive amount without contributing much is quite funny.
What has football turned to these days. Casimero hasn't being up to standard since joining United from Madrid, but the initial overzealous agreement has made him become a burden to the club at this point. Saudi is definitely the last option and solution to this problem, because i don't think any club in Europe will make a salary offer of more than 250K to a 32 years old. That salary if been split, will cover up for two players with age advantage.
Many players have had their performance affected by the negative clouds surrounding Manchester United, and even the recently loaned out player Anthony is doing very well in Real Betis. It will not come as a shock to me if Casimero moves from Manchester United to another club in Europe and then hits peak performance almost like the days of his prime again.
He deserves a contract extension of he wants to remain at the club since he's still performing at the top of his game for the Spanish giants
While he is still at the club, it will be smart for Barcelona to begin considering a younger striker to replace him in the team, and try to bring the striker in so the transition process will be smooth.