Philip Rivers has a bulging disk in his lower back and may need surgery in the offseason.
Rivers has dealt with a rib ailment for much of the season, but the back is the present issue and what forced him to miss recent practice time.
Rivers was 33-for-54 with 356 yards, four touchdowns and three interceptions Saturday at Levi's Stadium in the San Diego Chargers' 38-35 comeback win.