Steelers' Derrick Harmon suffers knee injury during preseason

TL;DR
Steelers rookie defensive lineman Derrick Harmon was injured and carted off with a knee injury during a preseason game, ruling him out for the game and impacting their defensive lineup.
- Steelers DL Derrick Harmon carted off with knee injury NBC Sports
- Steelers' 1st-round pick Derrick Harmon leaves preseason game vs. Carolina with knee injury Pittsburgh Post-Gazette
- Steelers' Derrick Harmon carted off with knee injury suffered during preseason game CBS News
- NFL news roundup: Saints to start Spender Rattler in preseason finale; Steelers DT Derrick Harmon injures knee NFL.com
- Pittsburgh Steelers DT Derrick Harmon carted off field with injury Behind the Steel Curtain
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