Lewandowski exit confirmed by Zorc
The 24-year-old Poland star has scored 14 goals in 20 Bundesliga games this season and his contract with Dortmund runs until June 2014, but he has been heavily linked to a move to rivals Bayern Munich once the deal expires.
"His contract runs until 2014. There are two options. Either he goes in June or he stays for another year," Zorc told German Sky while ruling out any chance of Lewandowski extending his contract.
The Poland star failed to score for the holders in Wednesday's 1-0 German Cup quarter-final defeat at Bayern Munich with second-placed Dortmund lagging 17 points behind the Bavarian giants in the Bundesliga.
Dortmund will want to sell their star striker rather than risk losing him on a free transfer in July 2014, but Bayern chairman Karl-Heinz Rummenigge has told German daily Bild: "We're not planning any negotiations with Dortmund".