The Steelers have placed linebacker T.J. Watt on the Reserve/COVID-19 list, per a club announcement. His availability moving forward will hinge on his vaccination status and test results. 
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Per league rules, vaccinated players who test positive can return after two negative tests, provided that they are asymptomatic. Unvaccinated players, on the other hand, are ruled out for a minimum of ten days.
Watt missed Week 11 against the Chargers with hip and knee injuries but returned on Sunday to face the Bengals. Now, his status for this week’s game against the Ravens is in flux.
Through nine games this year, Watt has 12.5 sacks, four passes defensed, three forced fumbles, and two fumble recoveries to his credit. The Steelers, stationed at 5-5-1, can ill afford to lose him at this stage of the season.
The Steelers still have a 10% chance of making the postseason, per Five Thirty Eight, but a loss to the Ravens would make it a near mathematical impossibility.