Gallagher is doubtful to be in the lineup on Thursday after being moved to the COVID-19 protocol list this morning. With Gallagher likely out, look for Cedric Paquette to draw back into the lineup.
Carrier has missed the last three games with an upper-body injury but will play Saturday in Montreal. Carrier has scored one goal with four assists (five points) in 13 games this season.
Pezzetta has skated in nine straight games for the Canadiens but will be scratched on Saturday with Chris Wideman dressing as a seventh defenseman.
Barre-Boulet has been a healthy scratch most of the time since returning from Seattle (via waivers), so he'll go to the AHL to get some playing time.
Caufield struggled with the Canadiens early in the season, failing to score a goal with one assist in 10 games. He went to Laval and picked up five points (2G / 3A) in six games. He should be plugged directly into the lineup Thursday vs. the Penguins.
Barre-Boulet will sit with Boris Katchouk returning from a lower-body injury. Barre-Boulet had previously played in seven straight games, scoring one goal with two assists.
Carrier was forced to leave Wednesday's game after getting hit in the head by a Tyler Seguin shot. Head coach John Hynes said that Carrier was "up and moving about" and travelled with the team to St. Louis last night. He'll be evaluated ahead of Thursday's contest.
Anderson was not on the ice for Tuesday's morning skate and will be a game-time decision vs. the Kings due to a non-COVID-19 related illness. Expect Adam Brooks to replace him in the lineup if he can't play.