The main reason he really wants to look for something new but on the other hand Bayern is something that is quite complex now. Bayern is one club that will almost certainly bring a trophy in every season, although not many, I think the trophy for the Bundesliga is almost certain to get.
As for Mane, maybe he wants to pursue something more there considering that even though he is at Liverpool he is already doing well but he is almost struggling to get personal achievements.
Getting a trophy, an achievement is something that every player wants to have. It might be partially true in the case of Mane but it isn't the only one. There is a hidden competition, rivalry, fight between him and the others. I remember he wasn't in a good mood with Salah previously for example that was solved later but what was almost obvious is the fact that he is receiving a lower salary than many others and Liverpool weren't planning to increase it. We are talking about half? what VD is taking, way under Salah and a bunch of other players. I am waiting to see his contract with Bayern to know whether the salary will increase a lot or just a little. As for Mane, maybe he wants to pursue something more there considering that even though he is at Liverpool he is already doing well but he is almost struggling to get personal achievements.
