Boston Bruins center Marc Savard is out indefinitely after being diagnosed with a grade two concussion following a blindside hit to the head by Pittsburgh’s Matt Cooke.

The incident happened in Sunday’s 2-1 Penguins’ win.

Savard lost consciousness on the play for close to 20 seconds, and lay motionless on the ice for several minutes while medical staff attended to him. The Bruins’ top pivot was then taken off on a stretcher, and taken to a local hospital.

Savard returned to Boston Monday where he met with team doctor Peter Asnis and a brain specialist at Massachusetts General Hospital and was diagnosed. He complained of constant headaches and exhaustion, common symptoms of concussions. The 32-year old also admitted he did not remember blanking out, or the events immediately leading up to the point that he took the hit. The team said they have to watch how Savard progresses over the next few days before they will know how long he will be out.

The player who made the hit said he was only finishing his check. Cooke has a sports book reputation for questionable hits, and has been suspended before for what is considered dirty play. However, because the league mandate does not forbid shoulder-to-head hits as long as the puck is in range, the NHL is not expected to levy a suspension.

The incident coincidentally corresponds with the annual NHL general manager meetings in Florida, where hits to the head are the main topic.