The NHL has postponed the Calgary Flames’ next three games after six players and a staff member entered the league’s COVID-19 protocol over a 24-hour period.

The Flames announced Monday that forwards Elias Lindholm, Andrew Mangiapane, Brad Richardson and Adam Ruzicka and defensemen Chris Tanev and Nikita Zadorov were in the protocol.

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Postponed games include Monday night’s game at Chicago, Tuesday’s game at Nashville and Thursday’s home game against Toronto.

The league said in a news release that the games were postponed due to concern with continued spread and the likelihood of additional positive cases. The Flames’ training facilities were closed until further notice.

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Calgary is the third NHL team this season to have games postponed due to a COVID-19 outbreak. Last month, the Ottawa Senators had three games postponed and the New York Islanders had two games postponed.