Jefferson (illness) reverted to the Ravens' practice squad Monday and was also placed on the COVID-19 list, Ryan Mink of the Ravens' official site reports.
Jefferson was active for his fourth game of the season in Sunday's loss to the Bengals. He recorded a season-high 10 tackles while also logging a sack. However, he automatically reverted back to the practice squad Monday and could also be unavailable for Sunday's game against the Rams.