The San Francisco 49ers released Bowman on Friday after seven seasons with the team. The 49ers agreed to the 29-year-old Bowman's request to be released after trade scenarios were investigated, according to general manager John Lynch and coach Kyle Shanahan.
Bowman could provide a boost to an Oakland defense that was shredded by Melvin Gordon in Sunday's 17-16 setback to the Los Angeles Chargers. The 24-year-old Gordon rushed for 83 yards and a touchdown and added nine receptions for 67 yards and a score.
The Raiders (2-4) return to action Thursday against the Kansas City Chiefs (5-1).
Bowman, who is listed at 6-foot, 242 pounds, was originally selected by the 49ers in the third round of the 2010 NFL Draft out of Penn State.
The eight-year veteran earned First-Team All-Pro honors four times in his career (2011-13, 2015), as well as three trips to the Pro Bowl (2013-14, 2016). During his career, he has appeared in 89 games (74 starts) and registered 808 tackles, 12.5 sacks, four interceptions (returning one for a touchdown), seven forced fumbles, five fumble recoveries and 28 passes defensed. Bowman also led the team in tackles in four of the previous six seasons (2011-13, 2015).
Bowman missed the entire 2014 season after suffering a gruesome leg injury in the 2013 NFC Championship Game loss to the Seattle Seahawks.
Bowman registered 38 tackles this season in his return from an October 2016 Achilles' tear.