The 2011 second-round draft pick was a major disappointment in four seasons with the Bucs, appearing in 50 games but only making 10 starts after entering the NFL as one of the nation's top college pass rushers.
Bowers, who has seven career sacks, had 21 tackles and 1 1/2 sacks in 11 games with Tampa Bay last season. He became an unrestricted free agent in March, but did not sign with another team.
The Bucs report for training camp on Friday.
AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL