Željko Sopić

Sopić started his professional career with NK Zagreb in 1994 and spent four years with the club's first team before leaving for Bundesliga side Borussia Mönchengladbach in 1998. He made 23 appearances and scored two goals in his only season in the German top flight. He went on to spend another season with Mönchengladbach in the 2. Bundesliga, following their relegation from the first division in 1999, before moving to league rivals LR Ahlen in the summer of 2000. He played for Ahlen until 2005, bringing his record in the 2. Bundesliga to a total of 155 appearances and 21 goals. He then returned to NK Zagreb for the 2005–06 season, before joining NK Slaven Belupo in the summer of 2006. In 2008, he returned to Zagreb but has played for NK Lokomotiva Zagreb in the Croatian First Football League.

He also won two international caps for the Croatian B national team, against Romania in 1998 and France in 1999.

Sopić started as a manager with NK Rudeš in 2012. He managed a club to 2015, and in 2016 he was named the caretaker manager for Dinamo Zagreb, after Zoran Mamić had left. Before that, Sopić worked as the manager for Dinamo Zagreb II in the Croatian Second Football League, and after that as the assistant manager for Ivaylo Petev in Dinamo Zagreb. On 30 January 2017, Sopić became the assistant for Zoran Mamić in Al-Ain, but two years later, on 30 January 2019, Mamić left Al-Ain, and Sopić became the manager of the club. On 26 November 2019, Sabah announced the appointment of Sopić on an 18-month contract. He was named manager of Gorica in November 2022, replacing Igor Angelovski. On 17 March 2025, Sopić was announced as the new manager of the Polish Ekstraklasa team Widzew Łódź on a deal until June 2027. On 25 August 2025, he was relieved of his duties as head coach. During his tenure, Widzew secured five victories, two draws, and suffered eight defeats, with a goal difference of 18–17. On 29 October 2025, Sopić was announced as the manager for Croatian Football League side Osijek. On 28 June 2026, A Lyga champion Kauno Žalgiris announced Sopić as the new manager after the sacking of title-winning coach Eivinas Černiauskas. In his first european tie with the Lithuanian club, he guided them to the second round of the 2026–27 UEFA Champions League qualifying phase defeating Kosovar champions Drita 4–3 on aggregate.

Sopić is the father of the German-born footballer Leon Sopić.