Bruins might have to shake up lines as David Krejci leaves practice with undisclosed injury » David Krejci, Kevin Bieksa

David Krejci led all skaters in postseason goals and points last spring. (AP)

David Krejci led all skaters in postseason goals and points last spring. (AP)

Boston Bruins center David Krejci slides into Vancouver Canucks defenseman Kevin Bieksa (3) in the first period of Game 6 of the NHL hockey Stanley Cup Finals, Monday, June 13, 2011, in Boston. (AP Photo/Elise Amendola)