Ohio State star safety Caleb Downs gave his reaction on Monday to the departure of defensive coordinator Jim Knowles, who left for Penn State.

Knowles, a Philadelphia native with strong ties to the Northeast, transformed the Buckeyes' defense during an impressive three-year stint. Ohio State ranked top three in total defense each of the past two seasons and led the nation by holding opponents to 254.6 yards per game and 4.2 yards per play during a historic campaign.

Guerrieri represents the continuity option. He's a Knowles guy through and through, initially coming with him to Ohio State as a senior analyst back in 2022. After a year apart at Indiana in 2023, Knowles missed him so much that he convinced Day to bring him back to Columbus, where he spent this past season as safeties coach.

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.

Penn State has lured Tom Knowles away from Ohio State. The Nittany Lions have hired Knowles to serve as their defensive coordinator.

The go-big hire of Ohio State's Jim Knowles signals a shift for Penn State football: Why it means so much now and later

Penn State football entered rarified air by stealing Ohio State defensive coordinator Jim Knowles away from the defending national champions.

Jim Knowles is expected to take the same position at Penn State, as first reported by Yahoo Sports' Ross Dellenger. The two sides are finalizing a three-year deal reportedly worth $3.1 million per season, making him the first college football coordinator to earn an annual salary of at least $3 million.

The Ohio State Buckeyes capped off a great season with a historic College Football Playoff National Championship win, but defensive coordinator Jim Knowles found himself elsewhere for the celebration.

Jim Knowles, Penn State's new defensive coordinator, brought his Penn State football history and some Philly ethos to his first meeting with the Nittany Lions. Knowles, whom Penn State hired away from Ohio State, introduced himself to the team this week, telling players and fellow coaches, "This is where I want to be."

Penn State has received plenty of praise over the past few weeks for retaining talent. Its latest move, hiring one of the nation's best defensive coordinators, has people buzzing.