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#1 Gary Cahill
Another top centre back on the club's radar, Cahill has had just 21 minutes of league action this season. However, Mourinho would not hesitate to sign Cahill, with whom he has enjoyed great success.
United's shaky defense have lacked a leader ever since the departure of Nemanja Vidic, but Gary Cahill could provide a short term solution to this.
The 32-year-old has fallen out of favour at Chelsea with Antonio Rudiger and David Luiz the preferred pairing under Maurizio Sarri. A re-link with former boss Mourinho would be ideal for all parties.
Currently Chelsea captain, Cahill, has served as England captain in the past and would bring much needed experience. Cahill is powerful in the air, but it is his exquisite passing range which is his greatest strength.
With his contract ending in the summer, Cahill could prove to be crucial in United's top 4 race.
