Amari Cooper remained off the field while media members were allowed to watch Thursday's practice. The 23-year-old currently is in the league's concussion protocol and also is battling an ankle issue.
With Michael Crabtree set to serve a one-game suspension for Sunday's fight with Denver Broncos cornerback Aqib Talib, the Raiders could be tasking wideouts Seth Roberts, Johnny Holton and Cordarrelle Patterson to pick up the slack.
Cooper departed Sunday's game after taking a shot to the head from Broncos safety Darian Stewart.
Earlier, Cooper caught a 9-yard touchdown pass from Derek Carr -- the first time as a Raider he's found the end zone in back-to-back games. The former first-round pick has 42 receptions for 499 yards and five touchdowns this season for the Raiders (5-6).