The England international was signed by former United manager Sir Alex Ferguson for £15m in January before being loaned back to Crystal Palace.
Moyes has been keen to keep Zaha at Old Trafford rather than send him out on loan again this season and he played in the Community Shield victory over Wigan at Wembley in August.
That is as near as the 20-year-old has come to the first team but Moyes insists he is still in his long-term plans.
"Wilf is one of the boys we have not been able to have a look at so far," he said.
"We always said we wanted him in. We needed him to see exactly what the level is like, and the boy is doing well.
"But Premier League games are important. We have to win them.
"So whilst there will be some players who get the opportunities sooner rather than later, some will have to wait their time because it is a fact you can only play 11."
A bit unfair to talk about how he ignored Barkley and Rooney when he is currently giving a teenager like Adnan a proper run in the side. That being said, the fact that Ashley Young gets a run in the side and Zaha can't even make the bench is nonsensical. DM hasn't had a chance to watch him? What the hell does that mean? Isn't that an admission of managerial imcompetence on some level? Isn't that you job? To assess ALL of your players and figure out which ones should play and which ones shouldn't? Or you could at least delegate the task to your staff. And unlike our other youngsters, Wilf cost a pretty penny. The Glazers can't be happy about seeing their 15m pound investment playing for the Under 21s. They can't be happy about a lot of things...- vpillai7