UDFA in 2022. He started all 17 games of the 2023 Chicago Bears season, where he registered 65 tackles, one interception, one sack, and seven tackles for loss. He was named to ESPN's 2023 ESPN "All-Youngster Team", a collection of players 24 years old and younger. In 2024, Sanborn played in all 17 games while starting in only 3. Sanborn had 35 tackles, 1.5 sacks, and 2 tackles for loss. The Bears announced after the season they would be non-tendering Sanborn making him a free agent. Obviously the Cowboys know a lot about him.