The Borussia Dortmund striker expressed a wish to move on during the transfer window, but the club's honchos have stressed he will not join the reigning European champion.
The Poland international has long been linked with a move to European champions Bayern and Manchester United, and stated his belief earlier this week that Dortmund would not stand in the way of a "dream" transfer.
However, Zorc has since moved to clarify that BVB will not allow another of the club's prized assets to join the reigning European, Bundesliga and DFB Pokal champions following the sale of Mario Gotze there for 37 million euros last month.
"We have communicated to the player and his advisers that we will not allow a transfer to Bayern this summer," Zorc told Kicker.
Watzke, meanwhile, expressed his belief that the 24-year-old will continue to apply himself professionally to Dortmund despite the ongoing speculation over his future.
"That he told us he wants to leave a few weeks ago is legitimate, but equally legitimate is when we point out our position with the current contract," Watzke explained to Bild. "He is perhaps now going through a small phase of disappointment, but then he will deliver his usual performance as a professional with character always does. And Robert has a lot of character."
Lewandowski's contract runs through the end of next season, and if he is not sold during this summer he could leave Dortmund then and join a team of his liking on a free transfer.