Pulisic, a longstanding target for Jurgen Klopp’s Liverpool, will enter the final year of his Dortmund contract this summer and is yet to agree to renewed terms.
The 20-year-old has found himself in and out of Lucien Favre’s starting line-up this season following injury spells and the emergence of fellow young talents Jadon Sancho and Jacob Bruun Larsen.
Liverpool submitted a £11million bid for Pulisic in the summer of 2016 and have retained an interest in the United States international ever since.
Zorc, however, has insisted that Dortmund will not allow the youngster to leave in the upcoming January transfer window.