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Report: Steelers Rookie Derrick Harmon Suffers MCL Sprain, Likely Out About a Month

Pittsburgh is weighing a short-term injured reserve move pending final imaging on the first-round pick’s knee.

Aug 9, 2025; Jacksonville, Florida, USA; Pittsburgh Steelers defensive tackle Derrick Harmon (99) rushes the passer against the Jacksonville Jaguars during a preseason game at EverBank Stadium. Mandatory Credit: Travis Register-Imagn Images/File Photo
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Derrick Harmon #99 of the Pittsburgh Steelers is carted off during the first half of the NFL Preseason 2025 game against the Carolina Panthers at Bank of America Stadium on August 21, 2025 in Charlotte, North Carolina.
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Overview

  • Harmon injured his knee in the second quarter of the preseason finale against the Panthers, was carted off, and was ruled out for the game.
  • Head coach Mike Tomlin said postgame that Harmon sustained a knee sprain and was undergoing further evaluation.
  • NFL.com’s Ian Rapoport reported it is an MCL sprain with an expected absence of roughly four weeks, putting Week 1 in serious doubt.
  • An MRI was scheduled to refine the prognosis after Harmon returned to the sideline in street clothes and walked to the bench under his own power.
  • The rookie No. 21 pick had been tracking to start on the defensive line, with Isaiahh Loudermilk, Daniel Ekuale, and Yahya Black among internal options if he misses time.