Yes, Mirotic is out because he is working on a new contract with the Bulls. And it seems too late to convince Ibaka to play this summer for the NT, so we will have one less weapon "inside" (Mirotic usually plays SF with Spain).
I'm a bit worried because Claver, Rudy Fernández and Ribas, the potential substitutes in this position, are also out. We'll probably start Abrines at the 3 position.