Things have been tough for the Red Devils at the back.
It has been a tough start to life as manager of Manchester United for Louis van Gaal in 2014/15, with Premier League defeats to Swansea City and Leicester City and a shock exit from the Capital One Cup at the hands of League One outfit MK Dons.
One main area that has been pinpointed as failing is defence, with van Gaal likely to have to call on youngsters Tom Thorpe or Paddy McNair against West Ham United on Saturday with Tyler Blackett, Jonny Evans, Phil Jones and Chris Smalling all out.
As a result the Red Devils have been linked with moves for several centre-backs and here are five they are targeting in the January transfer window.
Mats Hummels, Borussia Dortmund
It’s likely that this 2014 World Cup winner would be the first choice for most fans at Old Trafford, with Hummels seemingly having everything in his game except perhaps pace, although as captain of Dortmund the 25-year-old is unlikely to leave the Signal Iduna Park anytime soon.