After Michigan football ran, ran again, and ran some more against rival Ohio State in 2021, Ryan Day recognized that he needed to make something of a drastic change. Out was longtime OSU staffer Kerry Coombs as the defensive coordinator, and in was Oklahoma State DC Jim Knowles.

Ohio State has lost its defensive coordinator to a Big Ten rival. Penn State announced Monday it had hired Jim Knowles as its defensive coordinator. According to multiple reports, Knowles reached a three-year contract with an average annual salary of $3.

As Ryan Day looks to hire his fourth defensive coordinator in seven seasons, here are potential candidates to replace Jim Knowles.