Ahead of the 2015–16 season, Haroun stayed at Cercle Brugge despite being relegated last season. At the start of the season, he continued to regain his first team place, playing in the midfield position. It wasn't until on 12 September 2015 when Haroun scored his first goal for the club, in a 3–3 draw against ASV Geel. This was followed up by scoring his second goal for the club, in a 1–0 win against Patro Eisden. He started in every matches until he missed one match, due to suspension. After serving a one match suspension, Haroun returned to the starting line–up, in a 1–1 draw against R.W.S. Bruxelles on 14 November 2015. During the 2015–16 season, he captained the side in a number of matches for the side. It wasn't until on 17 January 2016 when Haroun scored his third goal for the club, in a 4–0 win against R.F.C. Seraing. He later added two more goals later in the season, scoring against K.S.K. Heist and K.V.V. Coxyde. Despite being suspended for second time later in the 2015–16 season, Haroun made thirty appearances and scoring five times in all competitions.