Sadio Mané hasn't had a good time since joining Bayern Munich from Liverpool. The star was out of the field for the entire season due to an injury at the beginning of the season, then he became a thorn in the club's neck in an argument with his teammate, which is why the club decided to sell him this season and finally sold him to the Saudi League. I think this change was necessary for Sadio Mané because he was not getting enough respect at Bayern Munich. If a player does not get enough respect from his club then he will never perform well on the field. Going from Europe to Saudi, I hope he will build a good relationship with his club teammates and perform well for his new club.
I think since Nagelsmaan was sacked, Sadio Mane started to feel things weren't too good at Bayern Munich because it was Nagelsmaan who wanted Bayern Munich to sign him. I think Sadio Mane is still in his best form and Al Nassr will not regret buying him from Bayern Munich because Al Nassr success in recruiting Sadio Mane will allow Al Nassr to compete more strongly next season.
In the depth of the bayern munich squad there are several gaps that must be overcome by tuchel in this transfer window. Because bayern munich is not so strong when they face big teams from other leagues like when they were defeated by manchester city in the pre-season match. So tuchel will have to make a decision to make some more changes to their squad depth such as recruiting an attacker in this transfer window.