Manchester United defender Axel Tuanzebe has told MUTV that making his first-team debut was "crazy" but said he will stay humble.
Tuanzebe, 19, was brought on as a 68th-minute substitute during the 4-0 home win over Wigan Athletic in the FA Cup fourth round on Sunday.
He said that striker Zlatan Ibrahimovic, who was an unused substitute, had told him to "keep it simple" -- and the teenager soon felt like he was playing in a Sunday League match.
Tuanzebe told MUTV: "It was crazy. I've been thinking about this since I was a little boy and, now it's come true, you're really over the moon. I can't really believe it's happened.
"Me and my family are very proud, but now it's just about getting back to the training ground and going again. If I'm with the under-23s, I'm with the under-23s, but I'll stay humble and keep working hard to get another opportunity to play again.
"I was on the touchline and I could hear Zlatan saying 'keep it simple, keep it simple,' so I wanted to follow his advice.
"After you start playing, you just concentrate on your own game. You get a feel for the ball, a couple of touches. Once you know you're playing, it's a reality. It's like you're playing Sunday League football."
Before coming on, Tuanzebe hugged Mourinho and shook hands with Wigan manager Warren Joyce -- the former United U21s manager who had helped nurture the player.
Tuanzebe said: "It's good to have Warren there too, you know. I grew up with him."