The Steelers placed two defensive starters, linebacker Joe Schobert and defensive lineman Chris Wormley, on the Reserve/COVID-19 List on Friday.
The team also placed defensive lineman Daniel Archibong on the Practice Squad/COVID-19 List.
Schobert has started every game this season at inside linebacker. He is the team's second leading tackler with 108 tackles, including 66 solo stops, and two tackles for a loss.
Wormley has started 13 of the 14 games he has played in. He has 44 tackles, including 26 solo hits, and six sacks and nine pressures.