OTTAWA -- Oilers forward Zack Kassian, who left the ice after a fight Monday, has been ruled out of Tuesday's rematch with the Senators with more time on the sidelines expected.
"I think it's going to be a week to week thing for him," Edmonton coach Dave Tippett told reporters Tuesday morning.
"They're doing some more evaluations," he added without elaborating.
The Oilers subsequently placed Kassian on injured reserve and called up Devin Shore from the taxi squad.
Ottawa coach D.J. Smith, meanwhile, said defenceman Erik Brannstrom will be out seven to 10 days after suffering an undisclosed injury Monday.
Kassian, who had been urged by Tippett to be more engaged in games, did not return after an early fight with Ottawa's Erik Gudbranson.
The six-foot-three 211-pounder saw just 33 seconds of ice time in the teams' third meeting in eight days. His bout with Gudbranson bout came in the first two minutes of the game, two seconds after Ottawa's Austin Watson and Edmonton's Jujhar Khaira dropped the gloves.
"It's an unfortunate injury," said Tippett. "You can get hurt with by a shot, you can get hurt in a fight. Injuries happen in hockey. Always, all different ways, not just fighting."
Ottawa (2-10-1) and Edmonton (7-7-0) play again Tuesday at the Canadian Tire Centre.
"I thought our group played well (Monday) night. We're going to have to back it up again tonight," said Tippett.
Defenceman Ethan Bear, who has not played since Jan. 30, remains out and is listed day-to-day, according to Tippett.
While veteran goaltender Mike Smith impressed in his season debut Monday after an injury absence, Tippett said he will be rested Tuesday in favour of Mikko Koskinen, who has played 12 games already this season.
Brannstrom will be replaced by Christian Wolanin in the Ottawa lineup. Smith thought the injury occurred when Brannstrom was hit hard behind the goal by Josh Archibald.
"He played through it for the game and did a good job battling for us. But after sleeping and getting up this morning, (he) wasn't nearly as good," said Smith.
The defenceman is expected to be out seven to 10 days.