Mark Stuart missed the morning practice Thursday and the team announced in the afternoon that he will be out until February with a lower body injury.
He was hurt in a fight at the end of the Jets' 5-1 win over Buffalo on Tuesday.
Two days ago, head coach Paul Maurice announced Jacob Trouba has an upper body injury and is likely out until February.
The Jets' injury roster also includes Tobias Enstrom and Zach Bogosian.
Mark Chiarot was called up from the St.John's Ice Caps two weeks ago to bolster the Jets blue line.
The Jets next take on the Bruins at home Friday night.