On Tuesday night, Bergeron took an inadvertent elbow to the head from Colin Greening of the Ottawa Senators while battling for a loose puck:
The Bruins had no update after the game, but Wednesday afternoon as he met with the media, GM Peter Chiarelli confirmed that indeed Bergeron had suffered a concussion. Chiarelli called it a "moderate" one, but a concussion is a concussion, and given Bergeron's history, there's concern for how much time he'll miss.
"I don't know when you'll see him again," Chiarelli said, who added Bergeron was in good spirits when he spoke with him. The team has no timetable on his return.
Bergeron is currently the Bruins leading scoring with 31 points and has an NHL-best 61.5% success rate on faceoffs.
Follow Sean Leahy on Twitter at @Sean_Leahy
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