The 21-year-old has impressed while on loan to Championship side Blackpool recently.
Coleman joined Everton in a £60,000 deal from League of Ireland side Sligo Rovers in January 2008.
“I think he’s someone who has caught the imagination of a lot of the supporters,” Everton boss David Moyes told the club’s official website.
“You’ve got to remember this is a boy we’ve taken from Ireland, we’ve paid £60,000 for him, we’ve brought him in and he’s had very little of what I would call senior football. So we had to get him some games.
“He had a terrible injury in pre-season which kept him out and, if it hadn’t been for that, he might have had more games and he might have even been further along.
“But I think these games for Blackpool, at the level they’re playing at, will do him no harm at all.”
