The NHL reintroduced stricter COVID-19 protocols Saturday that include daily testing and other steps in a bid to limit a growing outbreak among players and team personnel.

The enhanced protocols will be put into effect immediately and last through Jan. 1 with an evaluation of their impact no later than Jan. 7. The move follows discussions between the NHL and NHL Players' Association as virus conditions worsen across North America.

Three teams -- Calgary, Colorado and Florida -- are virtually shut down through next week because of virus cases. About 70 players -- 10% of the 700 leaguewide -- are in the NHL's COVID-19 protocols, and the number of games postponed this season has climbed to 20.

Several Canadian provinces are or will soon limit attendance at large events like NHL games to 50% of capacity.

Besides the daily testing for players and coaches, "additional pre-game testing may be implemented, on a case-by-case basis, when a COVID outbreak occurs within a team," the league said.

The NHL said the omicron variant is responsible for the uptick in cases.

"Given the increased number of positive cases in our league within the last two weeks, and changing societal realities with the new omicron COVID-19 variant, the NHLPA and NHL have collectively agreed that all Clubs shall be required to follow enhanced preventative and detection measures," the league said.

Moments after the announcement, the Detroit Red Wings placed three players, coach Jeff Blashill and assistant coach Alex Tanguay in the protocols ahead of Saturday night's home game against the New Jersey Devils. The Red Wings have the only player in the league, Tyler Bertuzzi, who is not vaccinated.

While postponed games might be rescheduled, all eyes on are the calendar. The NHL plans to allow its players to participate in the Winter Olympics in China in February -- unless COVID-19 disruptions prove to be too much.

The NHL has until Jan. 10 to opt out of the Winter Games without financial penalty but retains the right to cancel its plans up until players are scheduled to travel to Beijing.