3:09 PM ET Ohio State is replacing defensive coordinator Greg Schiano with a pair of new defensive coaches, one of them a longtime assistant from rival Michigan. Former Wolverine defensive line coach Greg Mattison and former San Francisco 49ers assistant Jeff Hafley will join the Buckeyes as co-defensive coordinators, the school announced Monday afternoon. The significant shake-up to the coaching staff comes at the conclusion of Ryan Day’s first week as the program’s new head coach. “I love the idea of having two coordinators on defense,” Day said in a press release. “I like having a diversity of opinion, but even more I like the expertise and experience that Jeff has in the secondary coupled with the expertise that Greg brings to the front seven.” Day and Hafley worked together for one season of the 49ers staff under Chip Kelly in 2016. Day also worked with Mattison on Urban Meyer’s…
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