Indianapolis is going younger at backup quarterback.
Undrafted out of Wisconsin in 2011, Tolzien was a developmental project under Jim Harbaugh in San Francisco and Mike McCarthy in Green Bay before graduating to Aaron Rodgers' backup in 2015.
He also spent time in San Diego with Norv Turner, who was a mentor for current Colts offensive coordinator Rob Chudzinski.
"We looked at a number of quarterbacks during this process and we felt Scott fit us on a number of levels," general manager Ryan Grigson said Friday. "He is a young, highly intelligent, tough and driven individual who we feel possesses a lot of potential."
Tolzien had been hoping for an opportunity to compete for a starting job this year.
"Scott Tolzien did a great job for us," McCarthy said. "I can't tell you how much he was a part of not only our quarterback room, but our locker room. His work ethic is exceptional."