David Moyes is prepared to play Marouane Fellaini in defence if the club's injury woes strike against Manchester City.
Michael Carrick and Marouane Fellaini have yet to prove they are anything like a solid central midfield partnership, so what about central defence?
Scarily, this prospect is a very real one against Manchester City, David Moyes has admitted, with the Red Devils just a couple of steps away from it.
Michael Carrick played at centre-back against West Ham, not for the first time - he did so for United when they faced Bayern Munich and were knocked out in the Champions League three seasons ago, and away to Everton last season - when he was dominated by none other than Marouane Fellaini.
David Moyes was the winning manager that day, and has faith in the Belgian to become a makeshift centre-back if the circumstances require it.
He told his press conference on Monday: "Michael did great at centre half. He's played there before so it wasn't a problem.
"We even considered putting [Marouane] Fellaini back there as well, so I think we've got people who can do that if we have to."
The Scotsman added that Patrice Evra could be drafted in at centre-half, adding: "It was great that the squad mucked in and that's the way it should be, when you are short in areas and it's all hands to the pumps."
Rio Ferdinand, Jonny Evans and Chris Smalling all missed the game at Upton Park through injury, with Nemanja Vidic suspended.
Ferdinand is the most likely of the trio to return, having been omitted against his former club as a precaution, and it's the game against City when he can really prove his worth in terms of winning a new contract if he is fit to play.
Fans will hope he is, because if not, just a couple of injuries to Evra or Jones could leave midfielder Fellaini with Carrick at the back against the second highest scoring side in the Premier League behind Liverpool.