Maguire was rewarded for an impressive season with Leicester City by being selected by Gareth Southgate for the tournament in Russia, which kicks off on Thursday.
The 25-year-old, who travelled to France to watch the Three Lions at the 2016 European Championships, told The Independent that he would have still headed to Russia had he not been selected to play.
"I was a fan, I still am a fan and if I wasn't selected to be in the England squad this time I'd be there," the defender said.
"I'd be a fan, I'd be watching it on TV, gearing up for games, still getting nervous.
"I'm passionate about England. I've always been [that way] growing up, and now I'm looking forward to the tournament."
Maguire has earned five caps in his time with the senior England team.