[3] He made his Danish Superliga debut for Nordsjælland on 22 November 2020 in a game against AaB.
[4] On 1 February 2022, Nnamani joined 1st Division club Nykøbing on loan for the rest of the season.
[5] Nnamani scored his first professional goal on 18 March in a 4–1 home loss to AC Horsens after coming on at half-time in a man of the match performance.
[6][7] On 15 May 2022 Nykøbing confirmed, that Nnamani had signed a permanent deal with the club, until June 2025.
[8] On 1 February 2024, Nnamani moved to Danish 1st Division side B.93, signing a deal until June 2026.