St Louis Blues center Alexander Steen, who ranks second in the National Hockey League this season with 24 goals, has a concussion and was placed on injured reserve on Saturday.
Blues general manager Doug Armstrong said that Steen, a strong candidate for Sweden's 2014 Sochi Winter Olympic squad, is able to exercise with the club but no timetable has been set for his return.
Armstrong said the injury was likely a result of several hits the 29-year-old sharpshooter incurred in recent games.
Steen, the Blues' top scorer this season, has already matched his career-best total for goals in a season from the 2009-10 campaign, his first full season in St Louis after coming over in a trade from Toronto.
Steen, who has also played for Modo and Frolunda in the Swedish elite league, has 147 goals in 572 career NHL games.