The incident happened in the third period of Montreal’s 3-2 shootout win at Detroit on Tuesday.
The 18-year-old Slafkovsky, the first overall pick in the 2022 draft, was assessed a major and game misconduct for driving Luff head-first into the boards with a check from behind.
Slafkovsky, who had three goals in 10 games this sesaon, will forfeit $10,270 in salary. He will miss Montreal’s game Wednesday night against Vancouver and Saturday's home game versus Pittsburgh.
Slafkovsky is eligible to return when Montreal hosts New Jersey on Tuesday.
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The Associated Press