The New England Patriots declined to exercise a $20 million option to secure Darrelle Revis' services for the 2015 season.
The Raiders issued contract tenders to five restricted free agents. Receiver Rod Streater got a second-round tender, virtually assuring he remains in Oakland.
The 2015 NFL Draft begins on April 30. The Raiders hold the No. 4 overall pick while the 49ers first select at No. 15.
Rotoworld.com draft expert Josh Norris ranks each position.
UPDATE (2:10 p.m. on Wednesday) -- The Raiders have officially signed unrestricted free agent center Rodney Hudson, the team announced in a press release.
Rodney Hudson is the top center headed for the free-agent market.