Haroun signed for Royal Antwerp on 26 December 2016, signing a two–year contract. Upon joining the club, he said: "I was certainly not tired of Cercle, but when Antwerp called, it started to itch. It is also important that I know the trainer and that he supports my arrival. The main thing is that I want to give myself completely for Antwerp. I am someone who always wets my chest and gives everything for the team. I want to wear the Antwerp logo in a dignified way."