Moyes will keep the 18- year-old as cover until the transfer window closes but will then let him leave on loan, with Sheffield Wednesday the most probable destination.
Moyes said: "I'm thinking about getting him some Championship experience maybe in the coming month or two. I can't do it right now until the squad is strong enough. I want him to go out and play. It seems right.
"I remember David Beckham coming to play when I was at Preston. You've got to remember Ross is still a boy."