Lewandowski turns down Dortmund

Lewandowski, who has been heavily linked with a move to Bundesliga rivals Bayern Munich, is tied to the Westphalian club until 2014 but Zorc told Germany's Sky television that he will not be signing a new deal.

The player's agent has informed Zorc that his client has no intention of staying on, meaning the only question is when the Poland international will leave Dortmund.

"Either he goes in June, or he stays another year," said Zorc.

Previously, Munich's Munchner Merkur newspaper had claimed that a deal had already been done between Lewandowski and Bayern, and that an official announcement would be made after this week's cup tie.

However, no announcement was forthcoming and Bayern has been keen to ignore the issue, with its director of sport Mathias Sammer recently saying he would "no longer comment" on the transfer speculation.

Dortmund coach Jurgen Klopp, meanwhile, chose to start some speculation of his own about Bayern's players after dismissing the Lewandowski issue.

"It doesn't interest us in the slightest," he told ARD television. "All I can say is what we have been repeating for weeks now.

"But what I would like to know is where Arjen Robben and Mario Gomez will be playing next season.

"I don't think they are going to stick around there for another season, so that's going to be intriguing."