However, Hainer has said that the 32-year-old "will honour his contract" at Allianz Arena, and the forward could even spend longer with the Bundesliga giants.
"Firstly, in my opinion, Lewandowski is best striker in the world. We are so happy that we have him in our team. He still has two more years on his contract," Hainer told Goal.
"He will definitely play those with Bayern Munich. I said it already a few weeks ago - I could imagine him staying with us for even longer. He will honour his contract. He will definitely play the next two seasons here in Bayern Munich."
Lewandowski scored 48 goals in 40 appearances for Bayern during the 2020-21 campaign, while he has scored 294 times in 329 outings for the club since arriving from Dortmund in July 2014. body check tags ::