Pittsburgh Steelers defensive lineman Derrick Harmon, the team's first-round draft pick, suffered a knee injury during the final preseason game against the Carolina Panthers. Harmon was carted off the field and did not return to the game. Head coach Mike Tomlin confirmed that Harmon sustained a knee sprain and is undergoing further evaluation. An MRI is scheduled to assess the extent of the injury. Reports indicate that Harmon has an MCL sprain and is expected to miss approximately one month. He is likely to start the regular season on injured reserve with a designation to return, avoiding a season-ending injury.