In week 8 of the 2021 season, Brantley had four tackles and the game-winning interception in a 37-33 win over rival Michigan.[2] In his freshman season in 2021, he played in eight games notching 18 tackles, four pass deflections, and an interception.[3] In week 6 of the 2022 season, Brantley picked off C. J. Stroud and returned it 32 yards for a touchdown versus Ohio State.[4] In the 2022 season, he started 11 games for the Spartans, where he totaled 48 tackles, a sack, six pass deflections, an interception, and a touchdown.[5] During the 2023 season, Brantley played in just three games before suffering a season-ending injury, where he had ten tackles, and a pass deflection.[6] In week 3 of the 2024 season, he returned an interception 100 yards for a touchdown in a 40-0 win over Prairie View A&M.[7]
On December 10th 2024, Brantley announced he was entering into the NCAA Transfer portal. On December 21st 2024, he announced on 'X' his intention to transfer to the University of Miami.
Personal life
Brantley is the cousin of former Michigan State and NFL wide receiver, Herb Haygood.[8]