"It was an absolutely massive shock," the 24-year-old told Southampton's official programme. "People had been talking (about a potential call-up) but I didn't take it in as I am a realist.
"I'd just played my third game in the Premier League and all I was interested in was doing well for Saints, but we'd had a tough start.
"I definitely learned a lot from being in the same squad as the likes of Steven Gerrard and Frank Lampard - they've got a massive aura about them so it was like being a little kid again. It's like your first day at school.
"Maybe another day in the future I will get another chance to train with them, but my club football is my bread-and-butter - that's all I'm focused on at the minute.
"I'll never let anything go to my head or run before I can walk. I'm so excited about the season here and starting to pick up a few more wins.
"The main thing for me is ensuring I do well for Southampton and keep the club in the Premier League."