I think if Lewandowski doesn't want to stay at Bayern Munich and is looking for a new team, then Bayern Munich management will be interested in signing Sadio Mane. Otherwise, they will not waste money on Sadio Mane. Their squad is already strong enough.
Despite Mane's decision to leave Liverpool, Mohamed Salah is likely to stay with Liverpool next season. If Salah and Mane had left Liverpool together, it would have been difficult for Liverpool to have a stable performance next season.
Sadio Mane has refused to sign a new contract with Liverpool so willingly or not Liverpool will have to let Mane go this season otherwise he will leave for free next season.
M.Salah will not leave Liverpool I'm sure of that and even Liverpool have prepared Darwin Núñez to look forward to next season and replace Sadio Mane so there will be a very good trio at Liverpool next season, M.Salah, Darwin Núñez and also Diogo Jota. this will make Liverpool's performance even better I think.
The decision to sell Sadio Mane will now be profitable for Liverpool. Although Mane is a very important player in the squad. His replacement is a bit difficult but not impossible. Darwin Núñez is a very talented player. Maybe he also scored 39 goals in Benfica's jersey last season. However, Darwin Núñez will need some time to adjust to the Liverpool squad. But if he is able to adapt to the Liverpool squad, I believe he will be a better player than Sadio Mane.