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Williams' placement on the reserve/COVID-19 list Friday was the result of a positive test, Adam Schefter of ESPN reports.

Even if he's vaccinated, Williams' positive test rules out the possibility of him playing Sunday in Denver, as he would have to be asymptomatic of the virus for 48 hours and test negative on two occasions at least 24 hours apart following his positive test Friday. According to Schefter, Williams went through practice Friday before being informed of his positive test, leaving the Lions concerned that other players may have contracted the virus or be considered close contacts. The team will administer another round of testing Sunday to be sure no other players need to be added to the reserve/COVID-19 list, but with top back D'Andre Swift (shoulder) sidelined along with Williams, the Lions will likely turn to a committee of Jermar Jefferson, Godwin Igwebuike and Craig Reynolds out of the backfield.

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