The Calgary Flames are now up to 18 players in the NHL's COVID-19 protocol.

Forward Dillon Dube and defenceman Oliver Kylington were added to the protocol Thursday, along with one member of the team's support staff.

The team announced Wednesday that 17 members of the organization were added to the protocol and will be out at least 10 days, including head coach Darryl Sutter, associate coach Kirk Muller, star forward Johnny Gaudreau and goalie Jacob Markstrom, along with some staff members.

Of the Flames active roster, only Matthew Tkachuk, Dan Vladar, Blake Coleman, Michael Stone, and Mikael Backlund remain off the list as of Thursday morning.

Some of the Flames players are dealing with the Omicron variant, though it's unclear exactly how many across the 30 members of the organization who have entered the protocol.

"Yes, we do have some confirmed cases that are omicron," A Flames representative said Thursday. "The sequencing process at the lab for each case takes several days to confirm the strain. It’s reasonable to assume that others are omicron as well but we can’t 100 per cent confirm prior to the results at the conclusion of each case in the lab process."

As of Wednesday afternoon, Flames games were postponed through Dec. 18, though the team could be sidelined until after Christmas.

“As an appropriate precaution, the team’s training facilities will remain closed for players until further notice,” the National Hockey League said in a release Wednesday afternoon. “The league is in the process of reviewing and revising the Flames’ regular season schedule, and will provide a further update next week.”