The news was reported via Twitter by Maple Leafs writer David Alter.
Lupul, who has missed 23 games this season because of a lower-body injury and a broken hand, has nine goals and 19 points in 32 games.
The Maple Leafs recalled defenseman Petter Granberg from the Toronto Marlies of the American Hockey League. Granberg is scoreless in three NHL games this season. He has one goal and seven points in 29 games with the Marlies.
Introducing the new official NHL App, available for iPhone, iPad and Android smartphones and tablets. A host of new features and improved functionality are available across all platforms, including a redesigned league-wide scoreboard, expanded news coverage, searchable video highlights, individual team experiences* and more. The new NHL App on your tablet also introduces new offerings such as 60fps video, Multitasking** and Picture-in-Picture.
*Available only for smartphones
** Available only for suported iPads