Canadiens coach Claude Julien told reporters Saturday that Drouin did not suffer a concussion.
Earlier Saturday, the team announced that the native of Sainte-Agathe-des-Monts, Que., was being placed on injured reserve.
Drouin left Friday’s game in the second period after being on the receiving of a thunderous hit from Washington’s Alex Ovechkin.
Ovechkin cut across the defensive zone and launched himself into the playmaking forward, landing on top of him.
Drouin, 24, returned to the game in the third and played 4:33 in the period. He finished the game with three shots in 12:20.
Julien said the injury occurred near the end of the final frame.
The third-overall pick in the 2013 NHL Draft has 15 points in 19 games with the Canadiens, his third season with the club.
In a corresponding move, the Canadiens announced that forward Charles Hudon has been recalled from the AHL’s Laval Rocket.
Hudon has recorded 11 points across 17 AHL games in 2019-20.