Vatanen left in the first period of the Ducks' 5-3 loss to the Washington Capitals on Sunday. He leads all Anaheim defensemen in points (34) and is third in the group in average time on ice (21:40). The third-year player was also the team's only defenseman to have appeared in all 57 games this year.
Tests showed no fractures or a need for surgery, reports Eric Stephens of The Orange County Register.
Left wing Matt Beleskey also exited Sunday's game with an unspecified upper-body injury. He is expected to miss two to four weeks, and both he and Vatanen are expected back for the playoffs. Beleskey has a career-high 21 goals and eight game-winners in 56 games this season.
The Ducks are third in the Western Conference with 77 points and a 35-15-7 record.
- Mike Fiammetta