LAS VEGAS -- Center William Karlsson sustained an apparent injury at the end of the first period of the Vegas Golden Knights' 4-3 overtime loss to the Anaheim Ducks on Saturday night.
It was unclear how he was injured. Karlsson didn't leave the ice with any noticeable ailment, but he did not return for the second period. After the loss, Golden Knights coach Bruce Cassidy said he believed Karlsson is day-to-day, but will have a better idea Monday after he is evaluated.
He set up the game's first goal with an outstanding pass behind the net to Brett Howden.
Karlsson has four goals and three assists this season. He had back-to-back 50-point seasons, but he had 29 in 53 games last season and was sidelined twice because of injuries.
The Knights rallied with two goals in the third period to force the extra session, but Anaheim defenseman Jacob Trouba ended it with an overtime goal on an assist from Leo Carlsson.
The Associated Press contributed to this report.