United are in London on Saturday when they take on QPR at Loftus Road, that is the start of a heavy schedule of five games in just 18 days, maybe more if there is a draw in the FA Cup match up with Manchester City.
On top of that, United are without the services of Nemanja Vidic, Javier Hernandez, Michael Owen, Tom Cleverley, Anderson, Rafael and Fabio, so there are a number of fringe players who will be expected to step up to the plate..
Ferguson told Inside United: "December is a particularly busy month when we often play eight or nine games. We've got a Boxing Day game, a New Year's Eve game... it's going to be a hectic spell and that's when the squad really kicks in."