The midfielder came off the bench to transform Saturday's win at Fulham.
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Moyes said: "Absolutely (he's reached my expectations). He said he would score me goals, so we've certainly not been disappointed with him. We've been so, so pleased with him.
"He was a huge miss for us in December and January. I hope he keeps doing it.
"I think he's still got a little bit to do to get to where he was (before the injury). But he's picked himself up well, and he's going well."
