Batshuayi joined Dortmund on loan on deadline day as part of a transfer merry-go-round which saw Pierre-Emerick Aubameyang move to Arsenal and Olivier Giroud sign with Chelsea.
Batshuayi made 32 league appearances for the Blues and scored seven goals.
After struggling to gain Antonio Conte’s trust at Stamford Bridge, Batshuayi will hope for more opportunities to impress in the Bundesliga.
But Zorc says that though Batshuayi is an able replacement for Aubameyang, there is no intention for them to hold onto the Belgian.
Zorc told German outlet Der Westen: ”We were not willing to splash out millions on a new No. 9 under pressure.
“We made a conscious decision for a loan because the market is tight in the winter.
“We looked closely at several attackers. Michy Batshuayi is a very good solution.”
After sealing his move to Dortmund, Batshuayi made clear that making Belgium’s World Cup squad was the aim.
He said: ”In order to reach my main goal, I want to play as much as I can and score many goals.
“In the summer, the World Cup takes place.”