Chelsea have used a number of players in front of the back-four this season, including Frank Lampard, John Obi Mikel, Ramires and Michael Essien, but it appears Mourinho is looking to improve that particular area of the field, having been strongly linked with moves for Guarin and Benfica's Nemanja Matic.
But new reports suggest that Mourinho will make a move for one of his former Inter Milan players, Esteban Cambiasso.
The 33-year-old Argentine midfielder looks set to leave the San Siro after becoming embroiled in a contract situation with new owner Erick Thohir. Cambiasso currently earns a reported £3.7million a year (£70,000 a week), and Thohir reportedly wants to ensure that no player earns over £2million with the club; and as Cambiasso has refused a pay-cut, the former Real Madrid man looks set for the exit.
His availability has also reportedly alerted Manchester United, with David Moyes still looking to strengthen the centre of his midfield at Old Trafford.
However, Cambiasso and Mourinho are believed to have a close relationship after Mourinho's spell with Inter, where the duo won two Serie A titles and the Champions League trophy during a glorious two-year spell together. The mutual respect between the two would almost certainly trump any interest from Manchester United and take the Argentine international to Stamford Bridge.
With Ramires and Lampard much more accustomed to getting forward rather than defending, Mourinho would be wise to move for the experienced holding midfielder, especially with rumours suggesting that Ghanaian Essien will be allowed to leave the club in order to find first-team football elsewhere.
Any move for Cambiasso would be reminiscent of Claude Makelele and how Chelsea flourished with someone sitting in front of the back-four during Mourinho's first spell in West London. Makelele's presence allowed Lampard to get forward and score the goals to fire Chelsea to Premier League glory.
With the Blues' strikers struggling to score goals this season, the reliance on the likes of Lampard, Eden Hazard, Oscar and Andre Schurrle will only grow, and having a natural holding midfield player like Cambiasso would certainly make their job easier.
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