Diaby-Fadiga made his first team debut for Nice on 7 December 2017, in a 1–0 away loss against Vitesse in Europa League entering the field after 66 minutes to replace Alassane Pléa.[1] In doing so, Diaby Fadiga became the first player born in the 21st century to appear for Nice.[2] He made his league debut the following season on 11 August 2018 against Reims, replacing Bassem Srarfi in the 61st minute of a 1–0 home loss.[3]
On 16 September 2019, Diaby-Fadiga stole a luxury watch at an estimated value of €70,000 from teammate Kasper Dolberg. He confessed to the crime seven days later,[4] and was sacked by Nice as a result.[5]
Paris FC
On 2 October 2019, Diaby-Fadiga signed for Ligue 2 side Paris FC.[6] On 8 July 2022, he was loaned to FC Eindhoven in the Netherlands.[7]
Jagiellonia Białystok
On 19 June 2024, he signed for Polish champions Jagiellonia Białystok on a free transfer, on a two-year deal with a one-year extension option, effective from 1 July.[8] A month later, on 19 July 2024, he scored a goal on his debut in 2–0 win over Puszcza Niepołomice,[9][7] after coming onto the pitch in the 81th minute, replacing Afimico Pululu.[5]
International career
Diaby-Fadiga was born in France and is of Guinean and Algerian descent. He is a youth international for France.[10]