Saliba began his football career at the youth level with As Bondy. Still, at the youth level, he played for FC Montfermeil and Saint-Etienne.
He began to play professional football for Saint-Etienne in 2018 and later signed a five-year deal with Arsenal on July 25, 2019, with a reported transfer fee of £27 million.
However, he went on loan to his former club Saint-Etienne from 2019-2020, to Nice (2020-2021), and Marseille (2021-2022) before he returned to Arsenal in 2022. He played his first match for Arsenal in a 2-0 win against Crystal Palace on August 5, 2022.
Saliba has represented France at the Under19, U-20, and U23 levels before being called up to the senior team on March 21, 2022. He made his debut in friendlies against the Ivory Coast and South Africa.
