The striker was handed his Under 21 debut at the European Championships this summer but heartbreak soon followed as the 19-year-old dislocated his shoulder during the pre-season friendly against Preston and is out for up to four months.
"James' injury is a big blow for both club and country," Pearce told evertonTV.
"Having worked with him in the summer and got to know him - he is a game player and got a big heart for the game. I think he has got a big future in the game so it is disappointing for all concerned.
"He has got the right mental approach to get himself back and vie for a place in the team. He is hopefully going to play a big part for Everton and for the Under 21s and maybe beyond that."