Manchester United are well-stocked at the back.
David Moyes can call on the experience of Rio Ferdinand and Nemanja Vidic at centre-half, or the growing talents of Jonny Evans, Chris Smalling and Phil Jones.
Rafael has made the right full-back position his own while, Patrice Evra rediscovered something like his best form at left-back last season.
Fabio is back from his loan spell at QPR to provide cover on the left or the right, while Alex Buttner was brought in last summer to offer a challenge to Evra's place.
But it hasn't stopped United being linked with reinforcements. United have been linked particularly with Everton's Leighton Baines, as reported by The Guardian's Andy Hunter. Benfica's Ezequiel Garay has also been strongly linked with the Red Devils, with Charles Perrin of the Express going as far as reporting that an agreement had been reached earlier this month.
But which defenders would improve United's defence, and which ones might Moyes be interested in?