Career
Born in Enfield, Onomah came through the academy system at Tottenham Hotspur. In the 2015-2016 season, Onomah changed his shirt number to 25, which was included on the club"s list of first-team numbers. He made his Premier League debut in a 3–1 home victory over Aston Villa on 2 November 2015, replacing Delegate Alli for the final minutes.
On 10 December, Onomah made his first start for Tottenham playing 90 minutes in a 4-1 victory over AS Monaco.
Onomah has represented England up to under-19 level In 2015, Onomah scored the equaliser against Croatia U-19 in a 1-1 draw.