Blues captain David Backes
left the Dec. 16 game against the Senators with an upper-body injury and did not return.
Backes collided with Ottawa's Colin Greening during an open-ice hit with 2:49 left in the second period at Canadian Tire Centre.
After the game, Blues Head Coach Ken Hitchcock said Backes was day-to-day.
Through 32 games this season, Backes has 16 goals and 14 assists, which ranks second on the team behind Alexander Steen.