Metellus saw some action as a backup during his true freshman season at Michigan, and garnered honorable mention all-Big Ten Conference during his sophomore season on the strength of three games started.[3]
After practicing at both free safety and strong safety in the spring,[4] his senior season included duties as an edge cover in the running game and a roaming safety in the passing game.[5] Metellus was named a team captain his senior season, and participated in the 2020 Senior Bowl and 2020 NFL Combine.[6]
Metellus was drafted by the Minnesota Vikings in the sixth round (205th overall) of the 2020 NFL draft.[9] He was waived by the Vikings during final roster cuts on September 5, 2020, and signed to the practice squad the next day.[10][11] He was promoted to the active roster on September 18, 2020.[12]
Metellus made his first career start in Week 3 of the 2022 season against the Detroit Lions, where he recorded his first career interception off Jared Goff in the final seconds of the fourth quarter in the 28–24 win.[13]
On September 7, 2023, Metellus signed a two-year contract extension with the Vikings.[14][15] During the 2023 season, he became notable for his versatility within Brian Flores' defense, playing in twelve different defensive positions through Week 14.[16]