LAS VEGAS -- Center William Karlsson sustained an apparent injury at the end of the first period of the Vegas Golden Knights ' game against the Anaheim Ducks on Saturday night.

Karlsson was ruled out for the rest of the game, according to the team's radio broadcast.

How he was injured was unclear. Karlsson didn't leave the ice with any noticeable ailment.

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 had 29 in 53 games last year, twice sidelined because of injuries.

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