Champions League hero Robert Lewandowski's agent has claimed that a deal is currently being negotiated for the striker to leave Borussia Dortmund at the end of the season.

Lewandowski scored all four goals as Dortmund thrashed Real Madrid 4-1 in the first leg of their Champions League semi-final last night but much of the post-match talk centred around his future.

The Poland international's contract expires at the end of next season, and it is widely expected the club will cash in on the forward despite claims Dortmund want him to stay.

The 24-year-old has been repeatedly linked with a move to Manchester United with Sir Alex Ferguson planning a £50million summer spending spree.

The player's agent Maik Barthel has suggested Dortmund have sanctioned his departure.

"We have reached an agreement with a club and intend (him) to move this summer," Barthel 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.

Don't Goe! Borussia Dortmund are set to lose Goetze to Bayern Munich (
Image:
Christof Koepsel)

"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."

Barthel stopped short of naming the club in question but speculation suggests it is Bayern Munich, who earlier this week agreed to activate the 37 million euros release clause of Dortmund playmaker Mario Gotze.

Losing two of their best players to their closest domestic rivals would be a major setback for Dortmund, who are also likely to meet Bayern in the Champions League final.

"We are getting 37 million for Gotze which we don't even want," said coach Jurgen Klopp, echoing the words of his club's general manager Hans-Joachim Watzke, who said he could "do without" a transfer fee for Lewandowski, as long as he stays for another year.

Watzke added on Sky television: "Our wish is explicit that he stays here.

"It all surprises me," said Watzke. "We are willing to do without a transfer fee for him (if he leaves as a free agent in 2014).

"I have had plenty of wishes in my life which have come true."