[3] Mokuna was originally talent-spotted by Sporting Lisbon which visited Léopoldville in 1954 during a tour of neighbouring Portuguese Angola.

[3] In 1957, Mokuna left the Congo for Belgium to play for KAA Gent ("La Gantoise") where he was twice the team's top goalscorer (1959 and 1960) and became "a club icon".

[3] At the time, it was widely assumed that Mokuna was the first African to play for a Belgian team and the first Congolese player in a European club.

He became the first black player to represent the country, though he blamed racial prejudice for not being selected for the main national side during the same period.

Mokuna returned to the Congo (later Zaire) after the end of his Belgian football career and worked in business.