Bergeron was scratched from Game 2 of the Eastern Conference finals against the Tampa Bay Lightning on Tuesday night. He also missed the opener, which the Lightning won 5-2.
Bergeron was injured in the finale of the second-round series against Philadelphia when he was hit by Claude Giroux. He practiced with the team for the first time on Monday.
The Bruins alternate captain missed most of the 2008-09 season with a severe concussion.