Adriatic League expanded from 14 to 16 teams before the 2004–05 season.

It was the second time since the inaugural 2001-02 that the competition expanded its number of teams.

16 teams from Slovenia, Croatia, Bosnia and Herzegovina, Serbia and Montenegro participated in Goodyear League in its fourth season: Union Olimpija, Helios, Pivovarna Laško, Geoplin Slovan, Cibona VIP, Zadar, Zagreb, Split Croatia Osiguranje, Šibenka Dalmare, Široki Hercegtisak, Bosna ASA BH TELECOM, Crvena zvezda, Partizan Pivara MB, Hemofarm, Reflex, Budućnost.

In this season the league also decided to change the play-off system.

Throughout the season, the issue of Partizan's forward Milan Gurović not being allowed to enter Croatia due to having a tattoo of Draža Mihailović on his left shoulder received much attention in the media.