So, it seems everything is clear before drawing. If we consider the first ranked teams for first pot and place second ranked teams and best 3rd team into second pot, then the situation before drawing will be like this.
Eczacibasi VitrA ISTANBUL
Unendo Yamamay BUSTO
Atom Trefl SOPOT
Busto can place into first pot in case of one of current teams in pot 1 being host.