Surgeons discovered Harrison suffered a torn ACL while performing knee surgery on him Thursday. The 23-year-old lineman will now be placed on season-ending IR, with hopes of returning in time for training camp next season. Harrison allowed just 13 pressures and two sacks in five games this season, earning a PFF pass-blocking grade of 67.2. Walker Little, who took over in Harrison’s absence, started last week against the Texans and will assume the starting left tackle role going forward.