Kassian was suspended Monday for the rest of the pre-season and the first five games of the regular season for a high-sticking incident against Edmonton that left Oilers centre Sam Gagner with a broken jaw.
The NHL announced the move in a press release.
The infraction occurred at 18:33 of the second period of the Oilers' 5-2 win on Saturday night. Gagner is expected to be out indefinitely, according to the team. Kassian, 22, received a double-minor on the play, which knocked several of Gagner's teeth out when the pair collided.
Also suspended was Canucks forward Dale Weise, who was banned for the rest of the pre-season for a hit to the head of Edmonton's Taylor Hall in the same game.