It's worth pointing out that, in the Telegraph article, Mourinho reiterated that he would prefer Mata to stay, but if the player forces his way out, the manager would surely look to be active in January.
Below are three options that could open up with the influx of money from a potential Mata transfer.
Gonzalo Higuain, Napoli
The Independent reported that Napoli rejected a £50 million bid from Chelsea for Gonzalo Higuain and, in that report, Mourinho admitted it would be difficult to get a player who only joined Napoli this season:
He’s a player I know I can’t get. He moved from Real Madrid to Napoli six months ago, is doing very well, adapted to Italy. Napoli is not a club that sells.
They want to win the Scudetto and Europa League. Why should we be interested in someone that is impossible to come?
Nevertheless, reports have emerged of Napoli's interest in Mata, so maybe Rafa Benitez could be persuaded to part with Higuain in a deal that includes Mata.
Chelsea bidding for Higuan. Smh. They should have took him last summer. Don't see Napoli letting him go that easy. Maybe if Mata is included— Mr Skhosana (@ntophonic) January 3, 2014
Chelsea have struggled in front of goal at times this year and another striking option would be beneficial to Mourinho's side.
Similarly, Benitez built the Chelsea side around Mata when he was at Stamford Bridge so knows the quality that the Spaniard offers.
In a World Cup year, all bets are off as to who stays and Mata could look to boost his profile with the national team by seeking first-team football under his former manager.
Ricardo Rodriguez, Wolfsburg
Despite a report in the Express that quotes Ricardo Rodriguez's agent as saying "in January, he will not move from Wolfsburg," money from a Mata transfer could allow Chelsea to make a bid that the German side could find difficult to turn down.
Chelsea are seeking a long-term replacement for Ashley Cole and Rodriguez would certainly fulfil that requirement.
He has been in good form this year, adding three goals and three assists to a string of solid defensive performances.
Needless to say, this has caught the eye of Premier League scouts, with both Chelsea and Manchester United looking to upgrade at left-back.
It would address an area of need and also contribute to Chelsea's attacking shortcomings. Agent comments are not always to be trusted, so this rumour is sure to last until the end of the transfer window.
Fredy Guarín in line to strengthen Chelsea title challenge http://t.co/dpB3mDOV9n— Times Sport (@TimesSport) January 3, 2014
Fredy Guarin, Inter Milan
This is a deal that could happen regardless of Mata's future at Stamford Bridge, with the Daily Mail recently quoting Fredy Guarin as saying that Mourinho "is simply No. 1."
With comments such as that fuelling the fire, Chelsea are in a good position to land the midfielder. While it could be argued that another midfielder isn't what the Blues need right now, Mata's exit would clear the way for Guarin's arrival.
If both Mata and Luiz were to leave Stamford Bridge, Mourinho would be more than justified in bringing in Guarin to add depth to his midfield.