The star striker has dropped back into a more creative role in the middle of the park in recent matches but Fergie insists it is just to cover some injury woes the club has at present.
"It's conditional, really, in the sense of midfield players I have available," said the United boss after the 2-0 Champions League over Otelul Galati last night.
"(Tom) Cleverley's still injured, Michael Carrick's just started to train today (Thursday), he wasn't available yesterday, Darren Fletcher wasn't available yesterday - so therefore you're limited in the choice of midfield players.
"There was a thought to put Phil Jones in (midfield) and put (Ezekiel) Fryers in (defence) to give him a test.
"We decided to play Wayne because he's got the appetite for it and the energy levels for it.
"Last night his awareness of people around him was really good. His first touch was excellent, which gave him the time to look up and move away from opponents. He did very well.
"But I'm not putting any marker down for that position for him. You want him to be in positions where he can get you more goals.
"I think that position is where he normally plays. It depends on what we've got in midfield."