The Toronto Maple Leafs' victory over the Calgary Flames on Sunday proved to be a costly one.

Head coach Sheldon Keefe revealed on Tuesday that goaltender Jack Campbell is expected to be out for "weeks" after incurring a leg injury during the 3-2 win.

While the 29-year-old Campbell appeared to be in visible discomfort during the game's final minutes, he remained in the game. The team has not revealed the source of the injury, but Flames forward Matthew Tkachuk fell knees-first on top of the goaltender in the game's final minute.

In his two starts this season, Campbell is 2-0 with a goals against average of 2.00 and a .923 save percentage.

Michael Hutchinson,  who made 20 appearances for the team over two seasons from 2018 to 2020, will now serve as Frederik Andersen's backup in Campbell's absence.

Goaltender Joseph Woll is expected to be summoned to the Leafs' taxi squad.

The Leafs and Flames face off again in Calgary later on Monday night.