Petrucci, 21, has yet to feature for United since moving in 2009 and he hopes he can make a breakthrough by catching the eye while at the Championship club.
He said: "It's a great thing to have, knowing that Sir Alex speaks to his son every day so you want to do as well as you can every day so he can hopefully tell him something good and I can go back there and play.
"I think 80 per cent of players do this step. Unless you're Wayne Rooney or a player like that, you have to start in the Championship and get experience. I want to do well and hopefully go back to United and play one day for the first team."