The New England Patriots placed starting defensive tackle Tommy Kelly on season-ending injured reserve on Saturday.
Kelly injured his right knee against the Cincinnati Bengals on Oct. 6. He returned to practice Wednesday but did not practice Friday, apparently due to a setback.
The Patriots promoted rookie guard Josh Kline from the practice squad to take Kelly's roster spot.
New England's front seven has been decimated by injuries as defensive tackle Vince Wilfork and linebacker Jerod Mayo are also out for the season.
Kelly has 23 tackles, 2.5 sacks, six quarterback hits and one fumble recovery.
The Patriots did add defensive tackle Isaac Sopoaga in a recent trade with the Philadelphia Eagles. New England also has rookies Marcus Forston, Chris Jones and Joe Vellano at the position.