The Poland international, who scored four goals in Wednesday's 4-1 Champions League rout of Real Madrid, would be able to leave the club for free upon the expiry of his contract at the end of next season.

However, his representative Maik Barthel claims that the German side are set to cash in at the conclusion of the current campaign.

"We have reached an agreement with a club and intend [him] to move this summer," he told Sport Bild.

"There is a very interesting offer for Robert which fulfils entirely the demands set by Dortmund and also the demands of Robert.

"Dortmund have assured us that Robert can move at the end of the season under these conditions.

"We stick to agreements and now it's up to the clubs to sort things out."

Lewandowski has scored 23 goals in 27 Bundesliga appearances so far this term.