Daniel Sedin returned to Vancouver for further medical evaluation after leaving Wednesday night's game in Chicago with a head injury as a result of an elbow from Blackhawks defenseman Duncan Keith, who was suspended for five games without pay by the NHL on Friday for the hit on Sedin.
Canucks forward Henrik Sedin spoke to his brother by phone Thursday.
"He has symptoms, a little bit of a headache, which comes with a hit like that," Henrik Sedin said.
Vancouver, on a four-game road trip, defeated Dallas 2-1 on Thursday night without Sedin.
The severity of Sedin's injury is not yet known.
Keith, the Blackhawks' top defenseman and the 2010 Norris Trophy winner, received only a minor penalty on the play, which took place in the first period.
"I'm not trying to hurt anybody," Keith said Wednesday night. "I hope he's OK. He's one of their best players. He needs to be on the ice."
Keith said several times he needed to see a replay of the hit before he could make a final assessment on it.
"It's a fast game," he said. "I'm not trying to hurt anyone. I haven't seen the replay so I really can't comment on it."
Sedin has 30 goals this season, most on the Northwest Division-leading Canucks, who lost the game to the Blackhawks 2-1 in overtime.
Information from ESPNChicago.com's Jesse Rogers, ESPN.com's Pierre LeBrun and The Associated Press was used in this report.