Redshirt freshman Matthias Farley, who has played well in the early going, will replace Slaughter. That gives the Irish three first-year starters in the secondary, and all of them are converted offensive players -- cornerbacks Bennett Jackson and true freshman KeiVarae Russell, and Farley.
"Those are things that coaches have to deal with all over the country," said ND coach Brian Kelly, who was particularly pleased with Russell's development over the first three games. "We're seeing the development of some really young players that can be really good players for us. We don't have to hide those guys."
Slaughter also missed much of the Purdue game with a shoulder injury, and the Irish defense fared well without him in both games. But it's still a big blow to a defense that was coming into its own.
"You lose a Jamoris Slaughter, you're losing an 'A' player," Kelly said. "Matthias is certainly not at the level yet of a Jamoris Slaughter. But we have a lot of confidence and trust in him, and he'll be getting a lot of work back there. We'll have to continue to develop him, but we have a lot of confidence in him."