The former Springfield High School standout is enrolled in classes at Toledo and has joined the team.
Koback announced his intention to transfer in early January in order to be closer to home.
An All-Ohio choice at Springfield, Koback amassed 1,096 rushing yards and scored 21 touchdowns for the Blue Devils as a senior in 2016 before suffering a broken leg in his fifth game of the season.
Koback sat out his freshman season at Kentucky in the fall as a redshirt.