Zola has praised the performance of Bielik on his Birmingham debut.
The defender made his bow at Preston North End on Tuesday.
"In general I would say it was a positive performance from him," Blues boss Zola told the club website. "In the first half he was suffering a bit. He was a little bit exposed. But second half he was good, so overall a positive.
"Krystian has been impressive in training for us and showed his qualities - he deserved an opportunity."