The Leicester defender only made his international debut last year, making the World Cup his first major tournament with the Three Lions.
"My friends were out there (at the Euros 2016), they actually went out there for a couple of games," he told the Independent.
"I had a few days spare in the summer so I thought there's nothing better than to go out there, to see the atmosphere. It was a great few days, to see the passion of the fans. It was a great experience and one I'd definitely do again. There were a few who recognised me – mainly Hull or Sheffield United fans. Not really too much which put me off from going. It was nice to interact and be part of it and mingle in with the fans without getting too much recognition, just to see the experience. It was nice to be out there.
"I really was over there acting like a fan, chanting away and enjoying myself with my mates. It was a great time. A great experience. Probably I'll be doing again in the future. I'm sure I'll be over there one time (or another) with my mates, whether it's in a near future or further away."
England's opening Group G fixture is against Tunisia on Monday, before playing against Panama and Belgium later this month.