Sancho has fallen out with Zorc and coach Lucien Favre over breaches of discipline, but management insist they still see a future with the England international.
Zoric told Kicker: "That is by no means the plan (that Sancho will be sold in January).
"We continue to have him in our plans. He is a very important player and I see no scenario where he leaves us."
Sancho's deal with Dortmund runs to 2022.