Sion Oppong

Brommapojkarna

Oppong was promoted to IF Brommapojkarna's senior team in January 2025, alongside teammate Oskar Cotton. He made his competitive debut on 23 February 2025, coming on as a substitute for Love Arrhov in a 3–0 Svenska Cupen win vs Örgryte IS. He made his Allsvenskan debut on 5 October 2025 in a 1–3 loss to BK Häcken, once again substituting Arrhov. During the season he also made appearances on loan at Viggbyholms IK and FC Stockholm. Oppong scored his first Allsvenskan goal on 4 May 2026, away from home against Halmstads BK. A few weeks later he scored his second, the lone goal in a 1–0 win vs. Kalmar FF.

Toulouse

On 7 August 2026, Oppong signed a four-season contract with Toulouse in France.

Oppong is a youth international for Sweden.