Wild rookie Mikael Granlund, the team's second-line center and a hero for the Finnish national team at the Sochi Olympics, is out indefinitely with an undisclosed upper body injury.

Granlund suffered what appeared to be a head injury Monday when his face smacked Jarret Stoll's left shoulder during a check along the boards in Monday's victory over the Kings in Los Angeles.

Granlund won't play Thursday against the defending Stanley Cup champion Blackhawks. Beyond that, coach Mike Yeo said he could shed little light on Granlund's status.

If it's a concussion, it could threaten his season. The Wild have six regular-season games remaining. Granlund suffered at least one concussion earlier this season, missing 13 games.

Without him in the lineup, the Wild struggled to score goals.

"We have to get past it," Yeo said. "If you're not scoring while you're out there, then you have to be good defensively and helping us get to our game.