For both players, team doctors confirmed a knee injury, and the recovery is expected to be 6 to 8 weeks for each.
Galchenyuk currently leads the Canadiens with nine goals, including two game winners, and 23 points through 25 games in 2016-17. The 22-year-old centerman has also posted a plus-9 plus/minus differential in that span.
Desharnais registered two assists against the Los Angeles Kings on Sunday, before being forced to leave Tuesday's game early in St. Louis after suffering a knee injury.
