The City goalkeeper, who spent the whole of last season on loan with Birmingham, was named in England coach Fabio Capello's 23-man party on Tuesday.
"Just going to the World Cup is really exciting," he said. "I can't really believe it.
"It's crazy, you know? I can't say I've even dreamed of it because it has come so quickly.
"I was quite happy watching the World Cup on TV and being part of the vibe back home because it is such an exciting time.
"Everything stands still for the games. If I wasn't in the squad I'd be cheering England on as a fan, so to be part of it is so exciting, I can't really put it in to words."
"I would like to think I have done everything I can, and am just concentrating on myself and trying to improve the team the best I can. If it means I play then great, but if not I can hold my head up," he said.
"But I'm not really concentrating on the US game as there are so many other hurdles to overcome."