Defensive lineman Derrick Harmon suffered a sprained knee in Thursday's preseason game and here's what it could mean for the Steelers.

Pittsburgh Steelers first-round pick Derrick Harmon was carted off the field during Thursday's preseason game against the Carolina Panthers after sustaining a knee sprain. Harmon is expected to be out for about a month,

Defensive tackle Derrick Harmon had to be carted off the field during Thursday’s preseason win over the Panthers after suffering a knee sprain. Harmon is expected to miss several weeks, according to the Pittsburgh Post-Gazette, and is set for an MRI exam on Friday.

An MRI confirmed the MCL sprain in the knee of Steelers first-round defensive lineman Derrick Harmon, Gerry Dulac of the Pittsburgh Post-Gazette reports.

After Pittsburgh Steelers rookie defensive tackle Derrick Harmon was carted off the field with a knee injury in Thursday's preseason win at Carolina, it appears he avoided the worst-case scenario.

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