Moyes is considering his options with Idrissa Gueye due to leave for Senegal's Africa Cup of Nations campaign.
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He said: “I’m really happy with how Harrison is doing. He’s coming on great.
“I think Preston would be hugely disappointed if we took him back. But he’s also got an injury at the moment as well, he’s been out for the last few games with an injury at Preston but hopefully he’s due back very shortly.
“We’ll consider it in January. But I think at the moment him getting the games at the age he’s at and where he’s performing and Preston hopefully will have a really good chance of making the play-offs and I think for him it’s a good level to be playing at.”