Beaulieu suffered a lower-body injury five minutes and 53 seconds into the third period of Montreal’s 2-1 shootout loss to the Nashville Predators Monday. After a brief trip to the locker room, Beaulieu returned to play shifts in the third before remaining on the bench throughout the overtime period.
Beaulieu’s injury occurred when he was taken heavily into the opposing net by Nashville’s Colin Wilson.
The 23-year-old has two goals and 15 assists in 56 games this season.
Defenceman Jeff Petry, who missed the last six games with a lower-body injury, is nearing a return and will travel with the Canadiens to Washington.
Forward Dale Weise, who missed Monday’s game with a virus, will also make the trip and potentially be available for Wedneday’s game.
Defenceman Victor Bartley is expected to make his debut with the Canadiens against the Capitals.
Bartley, who was traded to Montreal on Jan. 15, was recalled Monday night after the Canadiens announced defenceman Tom Gilbert will undergo surgery to repair a left knee injury that will keep him out of action for the remainder of the year.