The Raiders on Thursday released Nelson, NFL Network's Tom Pelissero reported, via a source informed of the situation. The team later announced the news.
Nelson's departure comes less than three months from when Raiders head coach Jon Gruden said the wide receiver would be back for 2019 shortly after the team gave Nelson a $3.6 million bonus for salary-cap purposes.
Nelson entered the league in 2008 as a second-round pick with the Packers on the heels of a prolific collegiate career at Kansas State University. On his professional career, Nelson has 613 catches for 8,587 yards and 72 touchdowns.