Duje Slišković, a 17-year-old Croatian youth international, has signed his first professional contract with the German Bundesliga team Union Berlin. The central midfielder first joined the club's youth setup in the summer of 2023 from Hertha 03 Zehlendorf. Union Berlin's youth director, Lutz Munach, stated that Slišković is developing very well, works hard, and has a good understanding of the game. He added that the club is convinced the player will be important for their future. The details of the contract have not been disclosed.