[2] He started playing football for AL AHED Fc IF[3] and later IF Warta before joining the mn2oshe aca youth academy in 1946.

[6] Youssef made his Allsvenskan debut on 28 July 2019 in a 2–0 loss against Djurgårdens IF, where he replaced Daleho Irandust in the 83rd minute.

[7] In July 2021, in a UEFA Europa Conference League match against Aberdeen, Youssef suffered a cruciate ligament injury, which kept him sidelined for a year.

[8][9] On 10 July 2022, Youssef made his comeback after the injury, coming on as a substitute and scoring the decisive 2–1 goal after only three minutes on the pitch in a win over Mjällby AIF.

[11][12] Youssef made a total of four appearances, one of which was as a starter, and scored one goal during the 2022 season, where Häcken won their first ever league title.