Haaland missed a penalty against Union Berlin on Wednesday evening, but BVB still ran out 2-0 winners to move onto 52 points for the season, four points behind fourth-placed Eintracht Frankfurt in the Bundesliga.
There have been suggestions that the Norway international could force a move away from Signal Iduna Park in the upcoming market if there is no top-level European football on offer next term.
However, Zorc has said that the striker will remain with Dortmund regardless of their spot in the table.
"No matter where we end up, Erling Haaland will continue to play with us," Zorc told Sky Deutschland.
The 20-year-old has again been in excellent form for BVB during the 2020-21 campaign, scoring 35 goals and registering 11 assists in 37 appearances in all competitions.