Participation is reserved to teams from associations that have an effective capacity to organise annually their own national championships.

As English champions King's Lynn resigned to its place, that was occupied by a fourth Italian team following the allocation criteria.

[2] The 16 teams were allocated into four pots, with the title holders, Reus Deportiu, being placed directly as head-team of the Group A.

The final four tournament is taking place at Pavilhão João Rocha in Lisbon, Portugal, on 11–12 May 2019.

The home ground of Sporting CP, one of the teams qualified for the final four, was selected as the host venue on 18 April.