Kelly was an off-season acquisition, expected to bolster the middle of the Patriots defensive line alongside nose tackle Vince Wilfork. After Kelly tweaked his knee late in week 5 against the Bengals, he returned to practice in Week 9 to face the Steelers. Unfortunately, he suffered a setback on Thursday and was held out of practice on Friday.
Through five games, Kelly notched 22 tackles, 2.5 sacks, and recovered a fumble. His size and presence will surely be missed. While rookie Chris Jones has certainly stepped up his performance, the depth at defensive tackle leaves a lot to be desired and you can be certain the Patriots will try and find an additional veteran body to add to the position, alongside the newly acquired Isaac Sopoaga.
In a corresponding roster move, the Patriots have called up practice squad guard Josh Kline to add depth in the loss of tackle Sebastian Vollmer, also to the injured reserve.