St. Louis Blues netminder Jake Allen exited Sunday's victory over the Colorado Avalanche after an 11-save first period.

It remains unclear what forced Allen from his start, as he was able to finish out the period and wasn't in obvious distress at any point. But head coach Ken Hitchcock did confirm with the NBC broadcast that he suffered an injury.

There was no update after the game. He will be evaluated further Monday.

Allen missed 17 games beginning in early January with a knee injury, whereas his partner, Brian Elliott, has missed stretches throughout the season, as well.

St. Louis' third-string goaltender, Anders Nilsson, finished the game, preserving Allen's win.

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