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on Monday morning, it was revealed that the Eagles have lost defensive backs coach Cory Undlin to the Lions, who will become Detroit’s new defensive coordinator.
The Lions are hiring Eagles defensive backs coach Cory Undlin as their new defensive coordinator, per league source.
Undlin and Lions head coach Matt Patricia both began their NFL careers together as coaching assistants with the Patriots in 2004.
— Field Yates (@FieldYates) January 13, 2020
The defensive coordinator position in Detroit is similar to the offensive coordinator position in Philadelphia, as in the head coach calls the plays.