Ruggs fully participated in practice Wednesday, was limited Thursday, and didn't practice at all Friday.
The rookie suffered a knee injury during his team's Week 1 victory over the Carolina Panthers. He still suited up his team's upset win against the New Orleans Saints in Week 2, playing in 61% of his team's offensive snaps.
The Raiders will likely continue looking to tight end Darren Waller to move the football in Ruggs' absence. Waller is the team's leading receiver with 18 receptions for 150 yards.
Ruggs caught four of his eight targets for 59 yards thus far this season. He is expected to be a big part of the Raiders' vertical passing offense once he returns.
The Raiders selected Ruggs 12th overall in this year's draft.