The news of significant drop in the market value Sadio Mane's after one season at Bayern Munich didn't come as a surprise to me and that's because of the players ill performance in his first season in Germany.
Sadio Mane before his move to Bayern Munich was considered as one of the best forward players in the world and was also the best African player but he didn't live up to the expectations of many.
He suffered many injuries, and had bad relationship with some members of the club, so that and many other reasons have contributed to the bad season he had in the club. He is not the first player to have a bad first season on just joining a new club, even players who do not fit well in a team are expected to do better in the next season, For Mane, he is simply wanted out of the club. It is a good time to consider joining the Saudi league to make some money like some other players his age are choosing to do.