Onyeka played U Sports football for the Wilfrid Laurier Golden Hawks from 2014 to 2017.

[3] In alignment with his ranking, he was selected with the 10th overall pick in the draft by the Edmonton Eskimos and signed with the team on May 16, 2018.

[6] On the first day of free agency, on February 9, 2021, Onyeka signed with the Saskatchewan Roughriders.

[7] He made a career-high eight defensive tackles against the Winnipeg Blue Bombers on September 11, 2021, in the Banjo Bowl.

[1] His younger brother, Kene Onyeka, plays professionally in the CFL as a defensive lineman.