With Rich Peverley extended, who’s next? » Chris Kelly, Zack Smith

Chris Kelly is among the Bruins' players set to become unrestricted free agents at season's end. (AP)

Chris Kelly is among the Bruins’ players set to become unrestricted free agents at season’s end. (AP)

Boston Bruins’ Chris Kelly, center, and Ottawa Senators Zack Smith, right, keep their eyes on the puck during a faceoff in the second period of an NHL preseason hockey game in Boston, Thursday, Sept. 29, 2011. (AP Photo/Charles Krupa)