 On 6 November 2015, Okenabirhie joined Isthmian League Premier Division side Harrow Borough.On 7 November he made his league debut for the club in a 4–1 win over Lewes and scored his first goal for the club in a 3–2 win over Wealdstone in the Middlesex Senior Cup three days later.He was a first team regular throughout the season with Harrow notching 10 goals in 34 appearances in all competitions as the side finished near the foot of the table.