At age 17, Ukić was already the team's captain. During his five years with the club, he won the Croatian League championship in 2003, and the Croatian Cup in 2004. In the Croatian Cup final against Zadar, Ukić scored the winning buzzer beater. Ukić played for Split until 2005, when he was drafted by the Toronto Raptors of the National Basketball Association (NBA) in the second round, with the 41st pick overall, after averaging 18.5 points and 4.3 assists, in 35.2 minutes per game, for Split in the ABA League.