Marc-Andre Fleury's gaffe has at least temporarily cost him his job.
Vegas head coach Peter DeBoer informed Lehner and Fleury of the decision Saturday, adds Kaplan.
DeBoer wouldn't confirm his starter when asked about it after Sunday's morning skate. Lehner was the first Golden Knights puck-stopper off the ice at the session, and that generally determines who gets the nod.
It will be Lehner's first appearance in these playoffs in exactly three weeks and only his second of 2021. The Swede surrendered seven goals on 37 shots in a 7-1 loss to the Colorado Avalanche in Game 1 of their second-round matchup.
Fleury had been mostly stellar in this postseason, but his giveaway in Game 3 against the Canadiens allowed Montreal to tie that contest in the final minutes and then win it in overtime.
The 36-year-old, who's a 2021 Vezina Trophy finalist, also outperformed Lehner during the regular season, though the soon-to-be 30-year-old goalie played only 19 games due to a concussion.
Lehner started every contest for Vegas during the 2019-20 playoffs but has suited up for only four games in the last 50 days.
Game 4 is scheduled for Sunday at 8 p.m. ET in Montreal.
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