The Wild captain suffered what the team would only call an "upper body" injury 7 1/2 minutes into the Wild's 3-2 shootout loss Saturday night to the big, bad St. Louis Blues at Scottrade Center.
Coach Mike Yeo offered no specifics regarding Koivu's injury, waiting for a diagnosis from team doctors in Minnesota. Named to his first All-Star Game on Thursday, Koivu was hurt in the corner of the Blues' end when checked by forward Vladimir Sobotka.
He immediately turned and headed to the bench, cradling his left arm like he had a shoulder injury.
Koivu has 33 points in 41 games this season and was just named to his first All-Star game on Thursday.