Knapp was named the Fighting Irish's starting left tackle ahead of his freshman season in 2024 after starter Charles Jagusah suffered a season-ending injury. Knapp was also named to the preseason freshman all-American team. In the 2025 [Orange Bowl], Knapp exited the game in the second quarter with an injury. After starting every game for the Fighting Irish in 2024, Knapp was named a freshman all-American.