Pittsburgh's top draft pick has been ruled out of tonight's preseason finale against Carolina. Here's what happened.

Pittsburgh Steelers first-round draft pick Derrick Harmon sprained a knee in the preseason finale against the Carolina ...

Pittsburgh Steelers first-round pick Derrick Harmon was carted off the field during Thursday's preseason game against the ...

Pittsburgh Steelers defensive lineman Derrick Harmon suffered an apparent injury during Thursday's preseason game.

Pittsburgh Steelers rookie defensive tackle Derrick Harmon was ruled out of the team's 19-10 preseason win over the Carolina ...

Pittsburgh Steelers defensive lineman Derrick Harmon suffered an injury in the first half of the preseason Week 3 game ...

The Pittsburgh Steelers may have caught a break on Derrick Harmon's injury, as the rookie was spotted walking back to the ...

: Steelers head coach Mike Tomlin told the media after the preseason game against Carolina that Derrick Harmon is dealing ...

First-round rookie DL Derrick Harmon suffered a knee injury and was carted off the field, leaving Steelers fans distraught on ...

Pittsburgh Steelers first-round pick Derrick Harmon was carted off the field during Thursday's preseason game against the ...

Pittsburgh Steelers first-round draft pick Derrick Harmon was carted to the locker room after the defensive end injured his ...

Pittsburgh Steelers rookie defensive lineman Derrick Harmon has left the team’s final preseason game against the Carolina ...