The Oilers on Tuesday placed veteran left wing Ethan Moreau on injured reserve with a dislocated right shoulder.
Moreau suffered the injury in the final minute of Saturday's 3-1 victory over the Red Wings, throwing a punch at Detroit's Danny Markov after the defenseman knocked down Jarret Stoll with a hard open-ice hit.
The 31-year-old Moreau, who did not dress for Edmonton's 5-2 over Phoenix on Monday, could require surgery to repair the injury, jeopardizing his chances of returning before the end of the regular season.
"Surgery is a definite option right now and it's probably the most realistic one," Moreau told the Edmonton Sun.
When asked about a possible return, Moreau did not appear very optimistic.
"We could be talking late in the season or playoffs, unless something changes," he told the paper. "It's not good."
In seven games this season, the left wing has registered one goal and 12 penalty minutes.
A first-round pick of the Chicago Blackhawks in 1994, Moreau had appeared in at least 74 games in each of his previous four seasons with the Oilers.
In 685 career games with Chicago and Edmonton, Moreau has recorded 117 goals and 107 assists for 224 points.