The loan star is expected to make it back to the squad for their upcoming Europa Conference League game against Olympiacos.
Youri Tielemans and Emi Martinez will miss the first leg at home, but Zaniolo may play a part.
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Manager Emery said pre-game: "Emi is out. Alex Moreno is close to coming back. Zaniolo could be in the squad because he is feeling better.
Tielemans is not available for tomorrow, but he is feeling good. The other players are available."
Asked if Martinez could play at the weekend, Emery said: "I don't know, he is feeling better."
Jacob Ramsey, Boubacar Kamara, Emi Buendia and Tyrone Mings are long term absentees.