[1] The defending champions are A-Híd Vasas Plaket, but they were eliminated by Jug AO Dubrovnik in the eight-finals.

The winners were Jug AO Dubrovnik, who defeated Primorje Erste Bank Rijeka 12–6 in an all-Croatian final.

The seeding was decided by as follows: Waspo'98 Hannover OSC Budapest CC Ortigia Szolnoki Dózsa RN Savona Radnički Kragujevac CN Barcelona (H) A-Híd Vasas Plaket HAVK Mladost Zagreb Primorac Kotor (H) VK Šabac (H) Telimar Palermo EN Tourcoing (H) CSM Oradea BVSC-Zugló (H) Panionios GSS (H) Pallanuoto Trieste CN Terrassa CN Noisy-le-Sec GS Apollon Smyrnis Partizan Beograd Solaris Šibenik SV Ludwigsburg 08 Endo Plus Service Honvéd Pays d'Aix Natation ASC Duisburg (H) G.S.

Peristeri Tenerife Echeyde Primorje Erste Bank Rijeka (H) OSC Potsdam VK Valis CN Mataró Panathinaikos Sète Natation White Sharks Hannover Dinamo București The draw took place on 26 September 2023 in Barcelona, Spain.

VK Šabac A-Híd Vasas Plaket Pallanuoto Trieste Primorje Erste Bank Rijeka Endo Plus Service Honvéd Telimar Palermo CN Barcelona Primorac Kotor CC Ortigia BVSC-Zugló EN Tourcoing Solaris Šibenik Panionios GSS RN Savona GS Apollon Smyrnis Waspo'98 Hannover The draw took place in Barcelona on 26 March 2024.

[19][20] Primorje Erste Bank Rijeka paid LEN 40,000 Euros in order to organise the event.