CBS Sports’ J.J. Watt reports T.J. Watt “had successful surgery to stabilize and repair a partially collapsed lung” on Wednesday.

According to Watt, the Steelers’ pass-rusher suffered a collapsed lung during a “dry needling treatment session at the facility.” Watt’s recovery time is unknown, but it’s safe to assume he will miss the Week 15 game against the Dolphins. Watt is expected to return at some point this season.