The New Orleans Saints trimmed their roster Monday by releasing safety Marcus Ball, linebacker Kyle Knox and safety Ty Zimmerman.

The moves came after the team drafted nine rookies and signed 13 undrafted players.

Ball was signed out of the Canadian Football League last season and played 98 snaps on defense, serving mostly in a reserve role. He also played on special teams.

Knox joined the Saints in 2013, serving on the practice squad before being promoted to the 53-man roster late in 2014. He was on three defensive snaps last season and played on special teams.

Zimmerman was signed as an undrafted free agent last season out of Kansas State, where he had 256 tackles, 13 interceptions and 27 passes defensed. But he spent the season on injured reserve.

The Saints’ undrafted rookie class is stacked with linemen. On the defensive line, the team signed Clemson’s Tavaris Barnes (6-foot-3, 275 pounds), Mississippi State’s Kaleb Eulls (6-4, 285), Texas-San Antonio’s Ashaad Mabry (6-3, 315) and Indiana’s Bobby Richardson (6-3, 286).

On the offensive line, New Orleans signed Syracuse tackle Sean Hickey (6-6, 306), North Texas’ Cyril Lemon (6-3, 315) and Notre Dame College’s Doniel Gambrell (6-6, 315).

New Hampshire receiver R.J. Harris (6-0, 194), Texas A&M receiver Malcome Kennedy (6-0, 205), New Hampshire tight end Harold Spears (6-4, 255) and North Carolina tight end Jack Tabb (6-3, 250) were signed at skill positions. The team also signed West Texas A&M linebacker Markus Pierce-Brewster (6-3, 243) and SMU linebacker Stephon Sanders (6-3, 250).