Slimane is well-established Tunisian international having made his name in Denmark, the country of his birth, with AB and more notably with Brøndby IF for whom he made over 100 appearances for prior to his move to South Yorkshire in the summer of 2023.

United acquired the services of the powerfully built midfielder on a three-year contract and he made 15 appearances in his first season as a Blade, with the majority of those coming as a substitute.