J.J. Watt on Friday said his younger brother, Pittsburgh Steelers linebacker T.J. Watt, had to undergo surgery after experiencing a partially collapsed lung following "a dry needling treatment session” at the team’s facility in Western Pennsylvania.

According to multiple reports, the Pittsburgh Steelers could face punishment from the NFL over T.J. Watt's punctured lung.

NFL Network’s Ian Rapoport reported that Watt underwent surgery to repair a partially collapsed lung suffered after a routine dry-needling treatment at the team facility. Rapoport added that while the issue can sometimes heal on its own, Watt’s situation required immediate intervention.

Well, the cause of Pittsburgh Steelers linebacker T.J. Watt's partial lung collapse has finally been revealed. According to his brother J.J., the injury was suffered during a dry needling session at the team facility. The elder Watt said he has surgery to stabilize it on Wednesday and is being released from the hospital on Friday.

Ex-Houston Texans DE JJ Watt revealed the latest on his brother, Pittsburgh Steelers LB TJ Watt, after he suffered a lung injury.