The Texans defense suffered two costly injuries to and on the same series against the Kansas City Chiefs on Sunday Night Football.
On the opening drive, Mercilus suffered a chest injury while making a tackle on Chiefs wide receiver Albert Wilson. Mercilus walked off the field after being examined by trainers, but will not return.
On the same series, J.J. Watt injured his knee on a pass play and limped off the field with assistance. Watt was examined on the sideline before being carted off to the locker room. Watt was also ruled out for the remainder of the game.