The Pittsburgh Steelers believe star pass-rusher and reigning NFL Defensive Player of the Year T.J. Watt suffered a torn pectoral during Sunday's 23-20 overtime win against the Bengals in Cincinnati, a source told ESPN's Adam Schefter.

Watt is scheduled to undergo scans Monday to confirm the diagnosis, the source said.

 The Steelers didn't provide any additional details postgame, with coach Mike Tomlin only saying that Watt was being evaluated for an upper-body injury.