Greer, 32, tore his ACL last November while playing for the Saints and decided not to attempt a comeback.
Greer played the first five seasons of his career with the Bills after going undrafted in 2004 out of Tennessee. He played the last five seasons with the Saints, winning a Super Bowl ring during his first season with the team.
He finishes his career with 13 interceptions, including four returned for touchdowns, and 348 tackles in 10 seasons.
- Paul Palladino