Bergeron apparently sustained the damage when Flyers forward Claude Giroux hit him in open ice early in the third period of Boston's 5-1 series-clinching victory on Friday. He left the ice and did not return.
Bruins general manager Peter Chiarelli reported the diagnosis on Saturday, saying that Bergeron did not go to the hospital, but did adhere to the NHL's new rules on concussions. Those guidelines included sitting in a quiet room for 15 minutes, being examined by team doctors, and undergoing some kind of head scan.
The 25-year-old Quebec native has two goals and 12 points in 11 playoff games thus far. He did not score but recorded five assists against Philly in the second round.
In the wake of a four-game sweep of 2010 East champion Philadelphia, the Bruins will take on the upstart Tampa Bay Lightning this coming week in the conference finals.
It is unclear if Bergeron will miss any time.