Matondo joined the youth academy of Auxerre in 2023 from US Grigny. In the 2024–25 season, he was the youngest member of the club's under-19 squad competing in the UEFA Youth League.[2] On 6 April 2025, Matondo made his professional debut as a substitute in a 1–0 Ligue 1 victory over Rennes.[3] It was reported later in the same month that league rivals Marseille were expressing interest in signing him over the summer.[4]
On 23 June 2025, Matondo signed his first professional contract with Auxerre for a term of three years.[5]
Born in France, Matondo is of Congolese descent from the Republic of the Congo. His older brother Rabby Nzingoula is also a professional footballer.[4]
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