During the summer, Coulibaly has been linked with several Championship clubs, including Swansea City. Talks with Swansea City have reportedly broken down in the last few days.

Soumaïla Coulibaly, a 22-year-old French-Malian centre-back, is transferring to Swansea City from Strasbourg. The left-footed defender is considered comfortable receiving the ball under pressure. Brest coach Éric Roy has praised him for this quality and for his maturity. Coulibaly is 1.91m tall and is described as proficient in aerial situations, quick, and agile for his size, with an ability to anticipate danger effectively. According to FotMob, Coulibaly's statistics from the previous season include a 90.2% pass completion rate, winning 63.6% of all duels and 67.5% of aerial duels. He also averaged approximately five clearances per 90 minutes. Coulibaly was signed by Strasbourg from Borussia Dortmund last summer and is set to complete his move to Swansea City this evening. Coulibaly has four caps for the France U20 team and holds a contract with Strasbourg until June 2029. His current market value is €6.00m, according to Transfermarkt.