David Rittich will start in place of Smith, who will miss at least two games because of a lower-body injury he sustained with two seconds left in the Flames' 3-2 win at the New York Islanders on Sunday. The Flames are in third place in the Pacific Division, two points behind the San Jose Sharks and one point ahead of the Los Angeles Kings.
Goaltender Tuukka Rask will start for the Bruins, who will look for their sixth win in seven games and 20th in 25. Rask is 17-1-2 with a 1.73 goals-against average and .938 save percentage in his past 20 starts for Boston, which is second in the Atlantic Division, three points behind the Tampa Bay Lightning and three points ahead of the Toronto Maple Leafs.
The Bruins are 8-2-0 in their past 10 games and 19-2-3 in their past 24.