The Dortmund striker expressed a wish to move on during the transfer window, but the club's sporting director has stressed he will not join the Bundesliga champions
The Poland international has long been linked with a move to European champions Bayern and Manchester United and revealed 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 their prized assets to join the Bundesliga champions following the sale of Mario Gotze for €37 million 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.
CEO Hans-Joachim 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."