Early reports indicated that David Krejci suffered a shoulder injury, but John Boruk of Comcast Sportsnet Philadelphia reported via Twitter that Krejci broke his wrist and is undergoing surgery in Baltimore:
@FSNFlyer
David Krejci with a broken wrist. Will have surgery in Baltimore. Out for series and likely season.
@HackswithHaggs Just confirmed through league source: Bruins/Sabres will actually start their series on Thursday. Game 2 Saturday and Boston games Mon/Wed
CSNNE.com's Joe Haggerty via Twitter
