Ryan Day is once again dealing with the consequences of success in college football after leading Ohio State to a national championship.

The departure of defensive coordinator Jim Knowles adds a challenge for Ohio State, which was already dealing with heavy roster turnover on defense.

Without defensive coordinator Jim Knowles in attendance on a day sources told ESPN's Pete Thamel he was finalizing a deal to join Penn State, Ohio State celebrated its national championship with 30,000 Buckeyes fans on Sunday at Ohio Stadium in Columbus.

With all but one head coaching vacancy filled in the NFL, the attention now turns to who will get the offensive coordinator spots that are open around the league. And sources tell CBS Sports that at the top of the list for several teams is former NFL head coach and current Ohio State offensive coordinator Chip Kelly.

While the Philadelphia Eagles are heading to New Orleans for Super Bowl LIX, their former head coach might be making a return to the NFL.