Carl Gunnarsson (upper body) will miss at least the Blues' next four outings.
Shea Weber (knee) continues to progress in his recovery but will not play this week, Renaud Lavoie of TVA Sports reports.
Jaden Schwartz (upper body) has been ruled out for the Blues' upcoming four contests.
Alexander Steen (upper body) remains day-to-day and won't suit up against the Kings on Monday.
Carter Hutton will start Monday's game in Pittsburgh, Paul Hamilton of WGR Sports Radio 550 reports.
Paul Byron (lower body) won't suit up during the Habs' upcoming two-game road trip, but may be healthy enough to join the team, Renaud Lavoie of TVA Sports reports.
Matt Cullen is expected to be out long term due to a lower-body injury.
Jesper Bratt has played well since making his debut Nov. 9. The 20-year-old Swede has four assists in his first six contests of 2018-19.
Casey DeSmith will patrol the blue paint against the Sabres on Monday, Michelle Crechiolo of Pens Inside Scoop reports.
Mats Zuccarello (lower body) won't be in action for Monday's meeting with Dallas, Colin Stephenson of Newsday reports.
Jake Allen will defend the cage versus Los Angeles on Monday, Lou Korac of NHL.com reports.
Henrik Lundqvist will tend the twine for Monday's matchup with Dallas, Colin Stephenson of Newsday reports.
Ilya Samsonov was reassigned to AHL Hershey on Monday.
Jonas Siegenthaler was promoted from AHL Hershey on Monday.
Sidney Crosby (upper body) won't play against the Sabres on Monday, Wes Crosby of NHL.com reports.
Evgeny Kuznetsov (upper body) will miss his second straight contest versus Montreal on Monday, Tom Gulitti of NHL.com reports.
T.J. Oshie (head) will not be in the lineup versus the Habs on Monday, Tom Gulitti of NHL.com reports.
Braden Holtby (upper body) will dress for Monday's matchup with Montreal, but will stay on the bench in favor of Pheonix Copley, Isabelle Khurshudyan of The Washington Post reports.
Pheonix Copley will be between the pipes for Monday's road clash with Montreal, Isabelle Khurshudyan of The Washington Post reports.
Carey Price will get the starting nod at home against the Capitals on Monday, Renaud Lavoie of TVA Sports reports.