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Reports: Steelers DT Derrick Harmon Out 4-6 Weeks with MCL Sprain

Derrick Harmon suffered a knee injury on a pass rush play and will not return to the game, prompting increased playing time for veteran Isaiahh Loudermilk, coach Mike Tomlin said.

  • On Thursday night in Charlotte, Pittsburgh Steelers first-round pick Derrick Harmon was carted off after a second-quarter knee injury in the preseason finale against the Carolina Panthers and was ruled out for the rest of the game.
  • During the play, Harmon powered through a block by Panthers rookie guard Luke Kandra and was met by Brandon Walton, causing his right knee to twist awkwardly on Thursday.
  • Additional imaging Friday confirmed an MCL sprain for Harmon, who is expected to be sidelined about one month and is a candidate to begin the season on injured reserve.
  • With Harmon sidelined, rookie Yahya Black could see a bigger role, veteran Isaiahh Loudermilk may get more playing time, and the Pittsburgh Steelers could deploy a committee to cover snaps.
  • Starting the season on injured reserve would make Harmon eligible after the Week 4 Minnesota Vikings game in Ireland, with the earliest return possible in Week 6 after the Steelers' Week 5 bye, missing key matchups.
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Steelers Now broke the news in on Friday, August 22, 2025.
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