In 2016, he started all 12 games at right tackle, earning All-Big Ten first-team award.

[2] He played in four games, starting two at both tackle spots, before being placed on injured reserve on November 29, 2017.

[5] He was released during final roster cuts on August 31, 2019 and was signed to the practice squad the next day.

[6][7] On October 30, 2019, Magnuson was signed by the Oakland Raiders off the Bills practice squad.

[11] Magnuson was fined US$15,000 by the NFL on October 5, 2020, for attending a charity event hosted by teammate Darren Waller during the COVID-19 pandemic in violation of the NFL's COVID-19 protocols for the 2020 season; these fines were later dropped.