Williams didn't practice Wednesday due to an illness, Lindsey Thiry of ESPN.com reports.
The Chargers' first official injury report of the week won't arrive until Thursday, with the team facing the Broncos on Monday. No matter the case, Williams' status is now worth tracking ahead of the Week 6 contest. In the Chargers' 30-28 win over the Browns in Week 5, Williams racked up 10 catches on 13 targets for 134 yards while No. 1 wideout Keenan Allen (hamstring) missed his fourth game in a row.