Tolzien spent three seasons with the Packers under coach Mike McCarthy, who has now hired Tolzien in Dallas.
Tolzien made a pair of starts with the Packers during the 2013 season with Aaron Rodgers sidelined by injury. He made two more starts during a stint with the Indianapolis Colts. Tolzien spent seven-years in the NFL.
Tolzien spent the last season scouting upcoming opponents for the Wisconsin Badgers.
McCarthy has also added former Packer Al Harris as an assistant secondary coach and former Packers director of player development Rob Davis as an assistant coach.