Bosa and Tillery's status for the Chargers' Week 11 game against the Pittsburgh Steelers on Sunday night is now in doubt.
NFL Network's Mike Garafolo reported there is still a scenario in place in which both players would be available to play, which would mean a player tested positive but is vaccinated or a player was a close contact (either vaccinated or unvaccinated). Garafolo added that four players across the NFL were placed on the reserve/COVID-19 list on Tuesday and three were positive tests and one was a close contact.
How quickly Bosa and Tillery can return to practice and if they can potentially play Sunday will depend largely on if they tested positive for COVID-19 and if they are vaccinated.
Vaccinated players who test positive need two negative tests at least 24 hours apart to return to the team. Unvaccinated players who test positive must isolate away from the team for a minimum of 10 days and test negative before being able to return. Unvaccinated players who are close contacts must isolate for five days and test negative each day prior to returning.
Through nine games, Bosa, a three-time Pro Bowler, has a team-high 5.5 sacks along with three forced fumbles and 28 tackles. Tillery has 30 tackles and 2.5 sacks.
Bosa and Tillery must be activated off the reserve/COVID-19 list by 4 p.m. ET Saturday to be eligible to play on Sunday.