I don't see a bright future for Sadio Mane at Bayern Munich. I think Mane's days are numbered if Harry Kane joins the team. Goal-scoring machine that he is, Kane will likely steal the show from Mane. I doubt Mane would be happy sitting on the bench for an entire season. So, if I were him, I'd begin looking for potential new clients and plotting my escape. Really, though, who wouldn't want that?
For Sadio Mane, I don't think there is any other choice but to leave Bayern Munich and try to take part in another club's offer, at least Sadio Mane got it. Looking at how Bayern Munich has treated him and the trouble he has often caused suggests there have been no matches against each other since he came to Allianz. Harry Kane is clearly much more interesting and still deserves to play a role in building attacks, Kane level of sharpness is still above Mane.