The NCAA denied Duke's appeal for immediate eligibility for Jeremy Cash, who transferred from Ohio State.
Cash played five games at safety as a freshman at Ohio State last season, but transferred to Duke in January.
• Iowa running back Barkley Hill and defensive back Ruben Lile suffered season-ending injuries and are expected to redshirt this season.
Hill, a true freshman, suffered a torn anterior cruciate ligament on an 8-yard touchdown run in Saturday's scrimmage.
Iowa lacks depth at running back after a slew of injuries and suspensions thinned the ranks.
Lile, a freshman, also has a knee injury, but the exact nature of it was not released.
• Illinois linebacker Henry Dickinson will miss the season because of leg and ankle fractures he suffered during a scrimmage last week. The sophomore had been competing for a starting spot.
• Notre Dame cornerback Lo Wood will miss the season because of an Achilles tendon injury he suffered in practice.
The junior was a starter in a secondary that is short on experience.