Bayern Munich have got Mane and there is no reason for them to keep Lewandowski at the Allianz Arena at the moment, yes Lewandowski has said that releasing him now is the best solution for both parties (Lewandowski and Bayer Munich), but it looks like Bayern Munich are still reluctant released their best striker to another club and it was seen when Bayern Munich again refused the money of 32 million euros + 5 million euros as a bonus from Barcelona, the refusal made by Munich is likely to make Barcelona withdraw from the competition for got Lewandowski, because if Bayern Munich still asks 40 million euros then barcelona have to think again because of their deteriorating financial condition.
Different typical between Sadio Mane and Robert Lewandowski and I think not have reason for Bayern Munich not keep Lewandowski keep stay for Bayern until his contract over. You can see statistic about Sadio Mane how most active playing on winger side than Jurgen Klopp make him as central forward, looks never have any chance when Sadio Mane as regular for Liverpool playing with central forward position, if left by Robert Lewandowski I don't think Bayern Munich have central forward except with not regular player like Choupo-Moting and he looks not usually get minutes playing still Lewandowski without injury.