DENVER (AP) — Colorado Avalanche goaltender Semyon Varlamov is sick and may not start a pivotal game against the Philadelphia Flyers on Wednesday night.

Varlamov has appeared in 21 straight games for the Avalanche, who are in the midst of a heated playoff chase. Varlamov is 23-16-6 with a 2.74 goals-against average this season.

Backup Jonathan Bernier remains sidelined as he deals with a cut on his hand that became infected. He was in goal and facing some shots during a morning skate Wednesday, but didn't have his stick.

The Avs are calling up Andrew Hammond from San Antonio of the American Hockey League as an insurance policy in case Varlamov can't play. The team also has goaltender Spencer Martin on the bench. Martin has yet to play a game this season.