Axel Tuanzebe has revealed the way Luke Shaw "shocked" him in his very first Manchester United training session.
The 20-year-old recalls being surprised by the physical differences between the youth team and the first-team players when he lined up against them for the first time.
He reveals turning up on the day expecting to watch the senior team play, before he, Marcus Rashford and Devonte Redmond, were required to demonstrate what they could do against the best at the club.
It seems Tuanzebe took a lot away from the experience, which left him wanting "more and more", but there was one person in particular who left a lasting impression - Shaw.
Recalling the session, Tuanzebe told Inside United: "You don't forget the first time you train with the first team.
"It was me, Marcus Rashford and Devonte Redmond, and we went up to training. It was one of the hardest sessions I've had in my life.
"I was in the Under-18s at the time and Paul McGuinness was our manager.
"We thought we were coming along to watch but we ended up playing in a training game.
"We were a position team, the first team against us. It was so hard, it was so fast, it was physically on another level.
"I remember vividly that Luke Shaw was absolutely rapid. It shocked me that I couldn't get near him.
"He was an absolute bullet, just amazing. From that moment, I had him as a benchmark for myself, in terms of how sharp he is.
"After that session, we had seen what we had to get to. Once we'd had a taste of it, then we all wanted more and more."
Shaw has struggled for first-team football under Jose Mourinho over the past two seasons, following his £30million transfer to the club.
The former Southampton left-back has featured only eight times for the Red Devils this campaign, with three of these games coming in the Carabao Cup.