Calgary Flames goaltender Mike Smith won't be available Tuesday against the Boston Bruins after suffering an apparent groin injury Sunday against the New York Islanders, head coach Glen Gulutzan said Monday, according to Postmedia's Kristen Anderson.

Backup netminder David Rittich was originally scheduled to start against the Bruins anyway.

Smith has been an absolute rock for the Flames this season, owning a .921 save percentage and 2.53 goals-against average in a league-leading 47 starts. If he's out for an extended period of time, it would be a massive blow to the team's playoff hopes.

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