MONTREAL - Alexei Emelin underwent arthroscopic surgery to his right knee on Wednesday in Montreal.
His recovery is expected to be four to six weeks.
The Russian was injured in the Canadiens' final regular season game in Buffalo and then missed the first four games of the series against the New York Rangers.
Emelin returned for Game 5 and went on to score a goal in Game 6.
During the regular season, Emelin finished ninth in the NHL in hits with 241.
He also put up 10 points, including two goals, in 76 games in 2016-17.