Buffalo Bills pass rusher Von Miller had a torn ACL after all and is out for the season after undergoing knee surgery.

Bills head coach Sean McDermott said Wednesday that the torn ACL was discovered during Tuesday’s exploratory surgery to repair the lateral meniscus and clean up cartilage damage in Miller’s knee. Surgeons ended up repairing Miller’s torn ACL.

An MRI and other tests did not originally detect the torn ACL, McDermott said.

“Unfortunate situation, for Von, obviously, and our team. Care for him, obviously, like we would any player,” McDermott said. “We know how much this means to him in terms of playing and being with the team, so we look forward to getting him back, obviously off the field for the rest of the season and his leadership, and we’re certainly thinking about him as he recovers here.”

Miller, 33, was placed on injured reserve last week, with the thinking being that he would return this season after damaging the lateral meniscus in his right knee against the Detroit Lions on Thanksgiving.

In 11 games (all starts) this season, Miller recorded eight sacks and 21 tackles while forcing one fumble. The eight-time Pro Bowl selection and three-time All-Pro is in his first season with the Bills after signing a six-year, $120 million deal in March.

–Field Level Media