Coach Mike Tomlin reiterated Saturday that Harmon sprained his knee and is week-to-week. Gerry Dulac of the Pittsburgh Post-Gazette reported that it’s a sprain to Harmon’s MCL, an injury that will keep him out only 4-6 weeks.

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