Inside reports speak of Bayern refusing to offer a two-year contract renewal for the 33-year-old including a salary rise and are only willing to offer one year for the Polish star striker Robert Lewandowski.
The 34-year-old wingers still has the legs to outrun most defenders.
The German league desperately needs a challenger to come forward.
Il Guerriero's signing is a major coup for the La Liga champions, especially if one considers his transfer fee.
The Gialorossi aren't impressed with United and Bayern's Twitter banter.
Manchester United are set to visit Bayern Munich on August 5 for a pre-season friendly.
The 29-year-old uses his unique style of humour to bring elicit smiles from his legions of supporters.
The other important player for Poland is Napoli's young midfielder Piotr Zielinski.
The 32-year-old suffered two foot injuries back-to-back and was a major doubt for the 2018 FIFA World Cup.
The veteran coach is going back into retirement after leading Bayern to another league title.
