The 24-year-old has been linked with a host of European clubs after scoring 22 league goals in Germany last season, but Zorc has quelled suggestions of a move.
"There have been enquiries from several clubs. Our position has not changed since March, Lewandowski still plays at Dortmund. I am repeating myself but Lewandowski will play next season for Dortmund," he told Bild.
Dortmund open their league campaign against Werder Bremen on Friday.