Through a series of public interviews, Lewandowski has made it clear that he is ready to leave the club after eight seasons.
He wants to take on a new challenge as he nears the end of his career. His birthday is in August.
Despite the fact that Robert Lewandowski has just one year left on his contract, the German side played hardball and failed to bring Barcelona to the negotiation table.
At the end of June, it was revealed that Barcelona had lodged a third bid, worth around 40m including add-ons, but had not received a response from the German club.
The two clubs were able to reach an agreement over a fee this week.
Each of the last two years, he has been named the best men's player in the world.
He played for Znicz Pruszkow, Legia Warsaw, and Delta Warsaw before joining the team from Lech Poznan.