The French club qualified for the Ligue Europa and are a candidate for the podium, but they waited until the last minutes of the mercato to reinforce their attack. Rennes have now completed their transfer business, with Dia joining the club on a prêt payant deal worth 2 million euros, including an option to buy for 8 million euros. The Sénégal international had previously played for Reims in Ligue 1, where he made 144 appearances, before moving to Spain and Villarreal, where he discovered the Ligue des champions in 2021. After his stint in Liga, Dia continued his career in Italy, first with Salernitana and then Lazio in 2024. He now returns to the French top-flight with Rennes.