Shoulder puts Prust out four weeks
The team made the announcement Monday on Twitter.
Prust was hurt in Saturday's 2-1 loss to the Nashville Predators when he crashed hard into the boards in the third period.
In eight games this season, Prust has two goals and an assist.
Habs forward Daniel Briere also left Saturday's game with a concussion. The team has not said how long he will be out.