There is always the chance that if an agreement with Atletico is not reached, that Nico would stay. That might still mean that Juve get Zhegrova and forget about O'Reily. Juventus currently have Locatelli, Thuram, McKennie, Miretti and Koopmeiners as central midfield options (4) for 2 spots. There are 3 spots up front where we only really have 4 options (Conceicao, Yildiz, David, Vlahovic).
Remember that the back up for Jao Mario could be Cambiaso and then you would have Kostic and Nico as left wing back options (as a wing back, Nico would be better on the left given he is left footed) better on the right as an inverted attacker for the same reason.
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It doesn't work that way. You are allowed 2 non-EU IN. Doesn't matter if you have non-EU out. That is at least my understanding. Correct me if I am wrong.