Yassin Oukili

Vitesse

On 5 September 2019, Oukili signed his first professional contract with Vitesse, after having joined the club from Alphense Boys as a youth player. He made his professional debut with Vitesse in a 3–0 Eredivisie win over FC Twente on 14 December 2019.

RKC Waalwijk

During the winter break in January 2021, Oukili signed a two-and-a-half-year contract with RKC Waalwijk, with an option for an additional season. Upon signing him, director of sports Frank van Mosselveld praised Oukili as a versatile midfielder, and said that he was a part of the club's "mission of signing talented players". On 21 August 2021, the second matchday of the 2021–22 season, Oukili made his debut for RKC in the 3–2 away loss against SC Heerenveen. He came on as a substitute for Ayman Azhil in the 84th minute.

Casa Pia

On 30 June 2025, Oukili moved to Portugal, signing a three-year contract with Primeira Liga club Casa Pia.

Fortuna Sittard

On 2 February 2026, Oukili moved to Eredivisie club Fortuna Sittard.

Born in the Netherlands, Oukili is of Moroccan descent. In November 2023, he was called up to the Morocco U23s.