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Steelers Rookie Derrick Harmon Diagnosed With MCL Sprain, Expected to Miss About a Month

An injured-reserve decision now looms, shaping Pittsburgh’s early defensive-line plans.

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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

  • Ian Rapoport of NFL Network reports Harmon sustained an MCL sprain and is expected to be out roughly one month, making him a candidate to start the season on IR.
  • Head coach Mike Tomlin said after the game that Harmon has a knee sprain and is being evaluated, with further testing informing the timeline.
  • The first-round pick was carted off during the preseason finale in Carolina but later returned to the sideline in street clothes and walked under his own power.
  • Harmon had been projected as a Week 1 starter on the Steelers’ defensive front alongside veterans Cam Heyward and Keeanu Benton.
  • If placed on injured reserve before cutdown, he must miss a minimum of four games, and players such as Daniel Ekuale, Isaiahh Loudermilk and rookie Yahya Black have been identified as candidates for expanded snaps.