However, Knowles wasn’t in attendance. About an hour later, reports surfaced that Knowles is leaving Ohio State to serve as Penn State’s next defensive coordinator. The move leaves Day searching for a replacement. Here’s who he might consider as he enters his seventh season as the Buckeyes' head coach.

Here are three potential options who could fill the Ohio State Buckeyes' defensive coordinator vacancy in 2025.

Penn State has lured Tom Knowles away from Ohio State. The Nittany Lions hired Knowles on Monday to serve as their defensive coordinator. Knowles held the same position with the national champion Buckeyes for three years.