Fielding, 23, was drafted into the squad as cover for the injured Robert Green. He is likely to be third choice, behind Joe Hart and David Stockdale.
The former Blackburn keeper found himself with the senior squad last season, having been a regular with the U21 side.
He said: "It's been a fantastic experience. It is an honour to have been called up and be part of the England squad.
"It's down to myself to work hard to be ready if called upon and learn from the experience.
"It's something that can benefit not just myself, but Derby County as well and I'm convinced it's a win-win situation for everyone."