FILE - Buffalo Sabres head coach Ralph Krueger looks on in the first period of an NHL hockey game against the Colorado Avalanche Wednesday, Feb. 26, 2020, in Denver. Krueger marked his return to practice Sunday, feb. 14, 2021 with an upbeat but cautionary message following a 10-day bout with what he called “moderately severe symptoms” of COVID-19. (AP Photo/David Zalubowski, file)

Vancouver Canucks' Alexander Edler sits in the penalty box, from which the glass has been removed as part of COVID-19 measures, during the second period of the team's NHL hockey game against the Calgary Flames on Saturday, Feb. 13, 2021, in Vancouver, British Columbia. (Darryl Dyck/The Canadian Press via AP)

Montreal Canadiens goaltender Jake Allen (34) stops Edmonton Oilers center Connor McDavid (97) as Canadiens defenseman Ben Chiarot (8) moves in during first-period NHL hockey game action in Montreal, Thursday, Feb. 11, 2021. (Ryan Remiorz/The Canadian Press via AP)