Johnson (knee) is questionable to return to Sunday's game against the Falcons.
Johnson was taken to the locker room on a cart after sustaining this injury at some point during the second half, Lindsey Thiry of ESPN.com reports. The starting nose tackle recorded 19 tackles, one sack and one pass defended over the first seven games of the season, and his absence will leave Christian Covington to step up into a larger role against Atlanta.