John Tavares is week to week for the Toronto Maple Leafs with a lower-body injury and was placed on injured reserve Thursday.
The center left practice early Wednesday after he took an awkward fall along the boards during a power-play drill.
"Week to week right now," Maple Leafs coach Craig Berube said. "It's unfortunate [it happened] in practice. Bad luck, but it is what it is and we have to move on from it right now. You see his production and what he's done, his leadership, he's been an all situational guy for us pretty much and he's done a great job for us."
Tavares has 42 points (20 goals, 22 assists) in 44 games this season while averaging 18:17 of ice time.
Forward Fraser Minten was recalled from Toronto of the American Hockey League.
"Guys just have to step up," Berube said. "Somebody is getting a better opportunity. I think when Auston [center Matthews] was out, we played a real strong team game every night. Relied on our checking and did the right things, special teams. We've got to stick to the program here."
Anthony Stolarz skated prior to the Maple Leafs' optional morning skate Thursday. The goalie has not played since sustaining a lower-body injury in the first period of a 3-2 win against the Anaheim Ducks on Dec. 12.
The goalie had a procedure Dec. 18 to remove a "loose body" behind his knee that was affecting his ability to straighten his leg. The initial timeline for the injury was 4-6 weeks, and Toronto has not offered a further update as to his potential return.
NHL.com independent correspondent Dave McCarthy contributed to this report