Van Riemsdyk, 26, has 14 goals and 15 assists for the Maple Leafs in 40 games. His 29 points lead the team.
He has been a durable player for the Leafs, missing just two games since being acquired in a 2012 trade from the Philadelphia Flyers.
The Maple Leafs also announced they have called up forward Josh Leivo from their AHL affiliate, the Toronto Marlies.
The 22-year-old Leivo, an AHL All-Star this season, has 11 goals and 19 assists in 35 games.