Donaire pulled out of the fight a few days ago, accusing Casimero of unwillingness to join the occasional Olympic doping screening system ahead of their August showdown. Rigondeaux did not put forward such conditions and agreed to a duel.
Casimero and Rigondeaux will fight for the WBA and WBO bantamweight belts. Probably the winner of the fight will cross gloves with Naoya Inoue of Japan at the end of the year.