Raffi Torres and the National Hockey League Players' Association are appealing the 25-game suspension that was given to the Phoenix Coyotes forward last month.
The appeal concerns the length of the suspension, not the actual ban itself.
Torres was given the punishment by the league on Apr. 21 after his late hit to the head of Chicago Blackhawks forward Marian Hossa during Game 3 of their first-round series.
The appeal could take place next week. NHL commissioner Gary Bettman acts as the arbitrator in such cases.
The suspension was the longest in the NHL since New York Islanders forward Chris Simon was handed a 30-game ban for stomping on the ankle of Jarkko Ruutu in December of 2007.