Bellingham was introduced in the 71st minute after replacing Felix Nmecha. This was his second consecutive game coming off the bench for Dortmund, sparking questions about Kovac's trust in him.
"I understand the questions, but we're at BVB, and at BVB, there's a lot of competition and quality in the team," the coach told reporters. "I know what he can do. He's 19 years old and new to us. So we don't need to write anything that's totally unimportant. The crucial thing is that we perform as a team; everyone is part of that."
Sporting director Sebastian Kehl also explained the situation, stating: "We've put a lot of effort into him (Bellingham) and don't need a topic about him every three days. In the end, we have a very, very large squad, which gives the coach several options."