Wide receivers David Gilreath and RashaanVaughn, along with kicker/punter Michael Palardy, were signed by the Raiders Thursday.
Gilreath (5-foot-9, 170 pounds) originally signed with Indianapolis as an undrafted free agent out of Wisconsin and in 2011 set Big Ten records for kickoff returns (135) and kickoff return yards (3,025). He has also had camp stops with Tampa Bay, Buffalo and St. Louis.
Vaughn, an Oakland native who played at Washington High in Fremont, College of San Mateo and at Oregon, was signed as an undrafted free agent by the Jets last season and eventually added to their practice squad.
Palardy, undrafted out of Tennessee, was 37 of 50 for his career on field goal attempts and averaged 42.9 yards on 117 punts in four seasons.
To make room on the roster, the Raiders waived San Jose State wide receiver Noel Grigsby, Stanford punter Daniel Zychlinski, and wide receiver Jared Green.