Lewandowski is not interested in staying at Bayern Munich, while Bayern Munich's management does not want to leave Lewandowski now. They will do their utmost to keep Lewandowski in the team. But I don't think Barcelona will spend a lot of money on Lewandowski now. Because Barcelona is in financial crisis now. Players like Lewandowski will find it difficult for Barcelona to bear the brunt.
Let's see how it goes in the end because there are only two options for Lewandowski now, the first is to stay with Bayern Munich and the second is to leave for another team.
And I think not only to Barcelona, but also to other big teams at the moment such as PSG, Chelsea and also Real Madrid because a player like Lewandowski will definitely be eyed by a lot of big teams at this time.
Actually, Lewandowski have spent a good number of years playing for Bayern Munich. And it high time, he probably leave for another club to at least encounter new challenges, and also lift other trophy. I don't really think Bayern will want to keep him in the team against his will. Barcelona is one of the club who are very much interested in signing Lewandowski. Although, it quite obvious that other big teams will compete for him, became despite his age, Lewandowski is possess great performance.