In 2007, Rahn began playing professionally for the Chicago Slaughter of the Continental Indoor Football League.
In 2008, Rahn played for the Milwaukee Bonecrushers of the CIFL, where he was moved to primarily Guard and Tight end, as well as reserve defensive lineman.
He signed with the Wisconsin Wolfpack, who would eventually play in the 2010 CIFL Championship Game, where they lost to the Cincinnati Commandos 54–40.
In 2011, Rahn signed with the Northern Kentucky River Monsters of the Ultimate Indoor Football League.
Since 2020, Matt has been the acting head coach of the College of DuPage Chaparrals football team.