The 1989–90 Yugoslav First Basketball League season was the 46th season of the Yugoslav First Basketball League, the highest professional basketball league in SFR Yugoslavia. The season saw new developments in the business aspect of basketball in Yugoslavia as a result of the Yugoslav First Basketball League's basketball talent becoming interesting to rich NBA teams. With the country's still-formally-enforced strict sporting exit rules—stipulating that no player is allowed to transfer abroad before turning 28 years of age—already being bent and occasionally loosened (superstar Dražen Petrović going to Real Madrid at the age of 24 one year earlier), summer 1989 saw two more high-profile star players leaving the league way before turning 28: twenty-one-year-old Vlade Divac joining the Los An