Notre Dame’s defense can talk all it wants about depth, returning production and a manageable early schedule. None of it matters quite as much as Kyngstonn Viliamu-Asa.
That’s the reality for the Irish in 2026. The 6-foot-3 junior linebacker from St.
John Bosco in Bellflower, California, was in the middle of one of the best sophomore seasons a college linebacker has put together in years before a torn left ACL against Syracuse in November shut him down. He has missed all of spring practice and is aiming to be back by training camp, which leaves Notre Dame with about two months of uncertainty around the most important piece on a defense built to chase a national title.
The numbers from his 11-game season explain why he’s still on this list despite the rehab cloud. Viliamu-Asa finished with 48 tackles, a team-best 7.5 tackles for loss, three sacks, an interception, a fumble recovery and two pass breakups. He wasn’t just productive - he was everywhere.
Pro Football Focus gave him an 89.7 overall grade, which ranked second among all Power Four linebackers behind only Texas Tech’s Jacob Rodriguez, the same player who swept the Nagurski, Bednarik, Butkus and Lombardi awards. Viliamu-Asa’s 94.0 run-defense grade was second in FBS, again trailing Rodriguez, and his 83.3 coverage grade ranked eighth.
Back in April, I had Viliamu-Asa as the No. 4 returning linebacker in college football. By late June, the Walter Camp Football Foundation had him on its second-team preseason All-America list, and he also showed up on the Lott IMPACT Trophy watch list.
The injury leaves Notre Dame in a familiar place: trying to turn a strong roster into one that can finally leave no room for doubt. The Irish went 10-2 in 2025 and missed the College Football Playoff, and that absence has become the program’s offseason refrain. Marcus Freeman has leaned on “Leave No Doubt” in nearly every public setting since December, and Viliamu-Asa has picked up the same language from the training room.
“I trust the training staff,” Viliamu-Asa said this spring. “I just want to make sure the next time I step on the field, I'm at 200 percent.”
Athletic trainer Rob Hunt said in March that Viliamu-Asa was in “perfect position” in his recovery and that the staff expects him back by early fall or training camp, depending on how he continues to hit milestones. For now, though, he remains out after missing spring ball.
New linebackers coach Brian Jean-Mary, who replaced Max Bullough, has even used Viliamu-Asa and captain Drayk Bowen like extra coaches while both were rehabbing, asking them to help clean up younger players between reps.
Notre Dame’s defense already has plenty to like. It finished 2025 eighth in Defensive F+ after a shaky start that included losses to Miami and Texas A&M in the first two weeks.
Chris Ash settled the group down after that, and over the final five games the Irish allowed just 12 points per game. They also bring back nine of their top 10 tacklers.
The supporting cast is real. Moore is a unanimous returning All-American at cornerback.
Boubacar Traore led the team with 6.5 sacks at defensive end. Alabama transfer Keon Keeley gives the pass rush another body off the edge.
And the schedule gives the defense some breathing room. Notre Dame does not face an opponent projected inside the SP+ top 50 until a mid-October trip to BYU, which gives the unit time to settle in before the stretch run.
Still, everything circles back to Viliamu-Asa’s left knee. If he comes back close to the player he was before the injury, Notre Dame has a case for being the best defense in college football. If the recovery lingers or the knee keeps him from moving laterally the way he did before, the Irish lose the one defender who can change games at all three levels.
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