It's going to happen from time to time. I said before the season began (in this thread, I think), that this would be one of Fergies greatest test, this season. Needs a CB, a RB and 4 MFs. At least we have replaced VDS with a decent keeper. This is the weakest Utd team I've seen since probably around 92-93 - which is why Mancini has to go if they finished 2nd and Dalglish should feel extremely pressured. This is not a very good Utd squad.
Rooney, Cleverley, Vidic, De Gea and Hernandez apart, there are a lot of current and future journeymen filling the roster.
Anderson, Nani, Carrick, both Da Silvas, Owen, Evans...there's a lot of people being paid for consistent mediocrity.