Pittsburgh Steelers defensive tackle Derrick Harmon knows he dodged a bullet but is "definitely frustrated" suffering a reported MCL sprain in Thursday's 19-10 win over the Carolina Panthers.

Steelers first-round pick Derrick Harmon said Saturday he initially feared the MCL sprain that took him out of the preseason finale was "serious."

Steelers head coach Mike Tomlin said at his postgame press conference that Harmon suffered a knee sprain and would undergo further evaluation of the injury. Harmon returned to the sideline during the second half and the Steelers will be hoping that's a sign that he'll be able to get back on the field soon.