The Toronto Maple Leafs will be without No. 1 goaltender Jack Campbell for at least the next two weeks because of a rib injury, head coach Sheldon Keefe said after Thursday’s morning skate.

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Keefe said the 30-year-old Campbell "tweaked something" a while ago and then aggravated the issue during a 26-save performance in Tuesday night’s 6-4 victory over the Seattle Kraken.

"I knew that he was uncomfortable after the game, and (Wednesday) wasn’t feeling a lot better," Keefe said. "They sent him for some tests and ultimately found out he needs some time."

Toronto Maple Leafs goaltender Jack Campbell (36) reacts after giving up a goal to the Vancouver Canucks during the first period of an NHL hockey game Saturday, March 5, 2022, in Toronto. (Frank Gunn/The Canadian Press via AP)

Campbell had an excellent start to the season to earn his first All-Star nod but has an .865 save percentage since mid-January.

Petr Mrazek, who signed a three-year contract in free agency in July, will take over in goal. Mrazek, who had a tough start to his tenure with the Maple Leafs after twice being felled by a groin injury, has a 10-5-0 record this season with an .890 save percentage.

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The Leafs have recalled Erik Kallgren from the AHL’s Toronto Marlies on an emergency basis. The 25-year-old Swede has a 15-8-1 record with a .904 save percentage in his first campaign with the Marlies. He's expected to serve as Mrazek’s backup Thursday against Arizona.