Quinn (6-4, 300) played at Arizona. Gallington (6-3, 315) is a Texas Tech product, while Mathis (6-2, 300) attended Texas A&M.
In corresponding moves, the Cardinals waived wide receivers LaRon Byrd and Tyler Shaw and defensive end Everrette Thompson. Byrd and Thompson were waived-injured. Per the club, Byrd has a concussion, while Thompson has an arm injury.
The Cardinals are at the 90-player roster limit.