The youngster was an unused substitute in the 5-0 rout in Austria and was again named to the bench as supporters asked him to start the second leg at home.
Mengi replaced Timothy Fosu-Mensah with six minutes left for his senior debut and the defender revealed he was delighted to repay Solskjaer’s confidence in him.
“It’s a great feeling. I would like to thank everyone around me. My family, my teammates and everyone in the first team made it very easy for me, ”said Mengi. MUTV.
“The academy staff as well as the manager who gave me the opportunity. This is just the beginning. It’s up to me to continue, but I’m very happy. ”
Mengi admitted it was a shame to have his first team greeted behind closed doors, meaning his family and friends couldn’t be in the stands to support him.
Nonetheless, he admitted that it did not take the “moment of his life” away.
He added: “Of course everyone dreams of this moment. It’s everyone’s dream – to represent the biggest club in the world. Fortunately, I had this chance today and I am really delighted.
“Everyone was telling me before the game and during half-time to be ready and that’s what I did. Everyone said: “Come on Teden, it’s your time now”.
“It’s such a shame because my mother harassed me all the time. She said: ‘If you ever make your debut at Old Trafford, I’ll be there watching you. It’s a shame she can’t be here but it’s the time of my life. But it’s time to start. ”
The 18-year-old believes his brief cameo made him hungrier to earn more first-team minutes and identified Brandon William’s progress as a huge motivator.
“I’m hungry for more definitely,” he said. “Again, this is just the start for me as a player. I have to keep kicking, keep developing, keep the same attitude in training and whatever else I can do. Then I hope to have more opportunities.
“Of course watching Brandon [Williams], we both play defense. When I saw him kicking it made me even hungrier. I thought ‘why can’t I do this?’ ”