In his last fight last August Indongo lost in the third round to Terence Crawford in the unification bout with four champions titles at stake.
"Julius was preparing for coming back, obviously this opportunity knocked," DiBella said. "Regis wanted the kind of opponent who would help him make a statement. He has that in Postol and now he has it with Indongo. It's one former world champion stepping in for another one. Postol and Indongo both have strong résumés with their only losses coming to 'Bud' Crawford. So things have worked out as well as they could."