Krug (undisclosed injury) rotated in on a defensive pairing with Zdeno Chara and Johnny Boychuk during Thursday's morning skate.
While coach Claude Julien said Wednesday that Krug is "fine" after the Bruins' recent layoff, those rolling with the blueliner will still want to monitor his status as Thursday's game game against Montreal approaches, given that he was rotating into the mix Thursday morning.
