The Ohio State Buckeyes surprisingly lost its defensive coordinator right after winning a national championship, with Penn State paying Knowles $3 million to leave Columbus. While Ryan Day likely made a strong pitch to keep Knowles in town,

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.