Moyes feels Mirallas hasn't been at his best since returning from a hamstring injury.
He said: "I don't think he is firing on all cylinders.
"He has not returned the way I would like him yet. He is still getting used to the Premier League and I think he has to create me more goals and score me more goals.
"That is what I am waiting for him to do, and he knows that - I have told him that. We are hoping for more. I think his form at the start of the season was excellent and we saw what he was capable of. I don't think we have really had that from him since he came back from his injury."