Montreal Canadiens interim coach Dominique Ducharme tested positive for COVID-19 and will miss Friday night's Game 3 against the visiting Vegas Golden Knights.
The best-of-seven Stanley Cup semifinal series is tied at 1-1.
All other tests administered to the players, coaches and hockey staff from both teams came back negative, the league announced in a statement Friday.
A test taken by Ducharme on Thursday in Las Vegas produced a presumptive positive result that was confirmed upon further testing Friday, the NHL said.
"Coach Ducharme has been partially vaccinated with his second shot administered less than two weeks ago, on June 9," the league statement said. "Per NHL COVID Protocols, Coach Ducharme was immediately isolated from the team."
The statement did not indicate how long Ducharme must remain in isolation or when he might safely rejoin the Canadiens.
General manager Marc Bergevin said Ducharme is doing fine at home and he isn't sure how long he'll be out.
Assistant coach Luke Richardson will be behind the bench Friday night in Ducharme's absence, with help from assistant coach Alex Burrows and goalie coach Sean Burke.
Ducharme, 48, led the Canadiens to a 15-16-7 record after taking over for the fired Claude Julien during the regular season. Montreal followed that up with two playoff series wins -- a seven-game victory against the Toronto Maple Leafs and a second-round sweep of the Winnipeg Jets.
--Field Level Media