But he admits he may have to resort to drastic measures to get the best out of him.
Moyes said: "Gibbo has done well, but I look at him and say, 'There's so much more that I need to get out of you'. Probably in the end Man United said, 'You're going to have to do more'.
"He could do with a little bit of the jockey's whip as you whip a horse now and again - to get it to go again.
"Tim Howard has been exceptional and Phil Neville has been great. Gibbo needs to become more influential and control games."