Manchester United are crying out for a centre-back who can play week-in, week-out for David Moyes' side.
The United manager has had to chop and change his central defensive partnership throughout the start of the season - due to injuries to Rio Ferdinand, Nemanja Vidic and Jonny Evans.
Manchester United captain Vidic and Ferdinand, in particular, have struggled with injuries over the last couple years which led to former manager Sir Alex Ferguson often having to change his centre-back combination.
Managers often like to rotate their players, as the big sides - such as Manchester United - have a congested fixture list due to their participation in domestic and European competitions.
However the one constant in most successful teams is the centre-back partnership, as it is important that the players in the heart of defence build a strong relationship with the goalkeeper.
The Red Devils got away with it last season as the likes of Robin van Persie and Wayne Rooney often dug them out of trouble.
However their luck seems to be running out this season, which is why Moyes should make a January move for Everton's Phil Jagielka.
Moyes forked out £4m to sign Jagielka in 2007, after the centre-back's former side Sheffield United were relegated to the Championship.
The now 31-year-old, under Moyes' tenure, went from strength to strength during his time at Goodison Park.
Jagielka's stock has risen so much that he is now England's first choice centre-back.
The Manchester-born defender would surely find it hard to turn down the chance of challenging for domestic honours and the temptation of Champions League football.
Moyes needs an established defender who can fit straight into the team, as Chris Smalling and Phil Jones are still not ready for a regular first-team role.
Jagielka, who could be prised away from Everton for about £10m, would be a good bit of business for Moyes' Manchester United.