The midfielder came on for the final 15 minutes of the friendly against Holland at Derby's Pride Park and certainly made his mark - a tackle earned him a booking within a minute and he then created and missed England's best chance of the half.
Back at Spurs Lodge, he's now concentrating on adding to his first team appearances this season.
"It was a great experience and I was delighted to get on," he reflected. "It's something I've always thought about, making my debut at any international level and for it to be Under-21s was excellent.
"When you come on you want to make an impact. There was no point coming on and plodding around so I wanted to get my tackles in and create an opportunity. Looking back, I should have scored.
"As I said, I thoroughly enjoyed the experience, it was an added bonus but my main aim all along is to stay in the squad."
Dean Marney is staying focused on his main aim of the season after the 'wonderful bonus' of earning his first England Under-21 cap this week.