Duclair started the season with the NHL's New York Rangers, scoring a goal and adding six assists in 18 games.
The high-scoring winger had four goals and four assists in seven world junior games.
Goaltender Zach Fucale will also be joining the Remparts. He was acquired from the Halifax Mooseheads in a trade just ahead of the world junior tournament.
The Remparts are hosting the Memorial Cup junior hockey championship this year.