Moyes told evertonfc.com: "Mikel was a big influence on the game against Standard Liege and he is beginning to look a lot more like himself.
"This is an important time for us and there are a lot of big games. He was one of the players who I said at the start of the season that I didn't think he would be ready.
"I thought it would take time for him to get back to where he was. But I think the signs are that he is just starting to get up to that level.
"It has maybe taken him five or six weeks to get up and running but the signs are good just now and we are pleased with him. We all know what he can do."