Daniel Wilco | NCAA.com | October 31, 2017 Who is the Packers' new backup, Joe Callahan? A former DIII star, to start. Former Wesley College quarterback Joe Callahan is Green Bay's new backup. Share After Green Bay Packers’ quarterback Aaron Rodgers suffered a broken collarbone in Week 6, the Packers turned to Brett Hundley to take over the starting job. And, in need of a new backup, coach Mike McCarthy signed second-year reserve Joe Callahan off of the practice squad. Callahan promoted to @packers active roster #GoWesley #d3fb https://t.co/998tS2UZ4q pic.twitter.com/rgirkoDwKm — Wesley Athletics (@WesleyAthletics) October 18, 2017 So, who is the new backup? Callahan, who went undrafted in 2016, was an unstoppable force at DIII Wesley College, setting a handful of school and NCAA records while under center for the Wolverines. Here’s what you need to know: Callahan holds the DIII record for total offense in a season with 5,466 yards in 2015, and passing yards in a season with 5,063. He has the record for most consecutive games passing for 200 yards or more with 13 in 2015, and the record for most games passing for 300 yards or more with 12, among a handful of other school and DIII records. On his career at Wesley, Callahan completed 918 of 1,429 pass attempts (64.2 pct.) for 12,878 yards, 130 touchdowns and 38 interceptions. Callahan threw for 510 yards and five touchdowns for a 33-21 win in his first career start as a redshirt sophomore, setting school single game records for completions (37) and passing yards. In his junior year at Wesley, Callahan compiled the (then) best season in school history with 4,190 passing yards and 46 TDs. In 2013, Callahan set DIII playoff records with 633 passing yards and eight touchdowns in a 62-59 loss to Mount Union. During his senior year, he racked up 5,063 yards and 55 TDs, becoming the first DIII quarterback to ever reach the 5,000 mark, and joining Hawaii’s Colt Brennan as the only other NCAA quarterback to throw for 5,000 yards and 55 TDs in a season. That senior season, Callahan averaged 389.6 passing yards and just over four touchdowns per game. He won the Gagliardi Trophy his senior year, the highest award in DIII football. Callahan went undrafted in 2016, but was picked up by the Packers as an undrafted free agent. In the 2016 preseason, Callahan threw for 499 yards, three touchdowns and zero interceptions with a 61.4 completion percentage in four games and two starts. In the 2017 preseason, Callahan had 112 yards, zero touchdowns and zero picks in three games with no starts.