Ten under-19 teams are participating at the 2017–18 Junior ABA League season – Budućnost VOLI, Cedevita, Cibona, Crvena zvezda mts, Igokea, Mega Bemax, Mornar, MZT Skopje Aerodrom, Partizan NIS and Petrol Olimpija - will be divided into two semi-final Groups.[3]
In Group A in Belgrade, Serbia are Crvena zvezda mts, Cibona, Mega Bemax, Mornar and MZT Skopje Aerodrom. In Group B in Zagreb, Croatia are Budućnost VOLI, Cedevita, Igokea, Partizan NIS and Petrol Olimpija.
In the group stage, all teams will face each other team within a group in a round-robin system. The two best placed teams of each group will advance to the final tournament, which will take place in Laktaši. At the final tournament, the teams will play two games – the semifinal and the final or third place game. The winner of the final tournament will become the 2017–18 ABA Junior Tournament Champion.