Sadio Mane struggles in the Bundelisga is not down to feeling comfortable or new environment; instead it has been down to niggling injuries; the Bayern medics have been unable to manage Sadio Mane fitness compared to his time at Liverpool; Going into his second season; i believe Sadio Mane fitness will be better and improve, he will already be accustomed to the training modules there and can get his fitness managed better. I am sure he prefers working with Tuchel than returning to the merseyside.
If it's still just a rumor, then just enjoy it first even though the certainty is still not necessarily true. It also doesn't matter to me if Sadio Mane can stay in Bundelisga in the Bayern Munich team, as long as it's for the better. But if after staying there, Sadio Mane's achievements have not improved and tend to be worse than before, then it means that it is time for Sadio Mane to find another team that wants to accommodate him and that is not in the Bundesliga.
After all, if Mane were to play again at Liverpool, then of course it looks like Bayern Munich will also be looking for a replacement first. Because after all, only being on loan can make Mane return to playing at Liverpool but I'm sure, that won't happen. Because yes, Liverpool will also only play in the Europa League and of course, Liverpool will still be fine without Mane because basically, relying too much on a few players is also not a healthy way to form a better performance.
I heard rumors that Liverpool after losing Mane went to Bayern Munich and Liverpool are trying to find a replacement and it seems that Liverpool's target is Federico Chiesa who comes from Juventus.
But not sure if this rumor is true because until now there has been no confirmation from Liverpool about this but these rumors sound like they are convincing.