Williams was removed from Monday's game against the Browns with a concussion.
Williams did not catch a pass in Monday's game before being forced from the contest. He will enter the league's concussion protocol, so he will need to be cleared in order to play in the Ravens' next game against the Dolphins.
Brown (back) is inactive for Monday's game against the Browns.
Brown, who has recorded just 14 catches for 112 yards in 10 games to date, is off the fantasy radar, but his absence is another hit the Ravens' depth at wideout. Jeremy Butler or Kaelin Clay could see some additional looks in his absence, but neither are high-percentage Week 12 darts, with Matt Schaub now the team's starting QB.
Eifert doesn't have any structural damage in his neck, but his status for this Sunday's game at Cleveland remains up in the air, Adam Schefter of ESPN reports.
Prior to departing with a stinger in the second half Sunday, Eifert corralled his 12th touchdown of the season during a three-catch, 40-yard effort. Due to his standing in the tight-end ranks, which have been hit hard by knee injuries to stalwarts like Rob Gronkowski and Jimmy Graham, Eifert's progress through the neck issue will be of keen interest this week.