The 16 year-old was given several late minutes as a second-half substitute by Frank.
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The Dane later said: "Yeah, very happy with that. I think it's always a pleasure to be part of a young player's debut. So, yeah, happy with that.
"I think that definitely over the last many years the focus on the talent development and academies across the world is so big. So the talent pool is bigger. There are these talents coming through that are younger and younger.
"But one thing is the debut when you're 16. The next step, and much more important, is how Luca or other players take those steps forward. It's very tough to keep going and then get into the first team as a really regular player. But the first step is very important."