Metro reports that Valencia believe they are leading the race to sign the 25-year-old in January.
Arsenal, Tottenham, Manchester United and Real Madrid are also reportedly keeping tabs on Mata’s situation at Stamford Bridge.
Mata is considering his future at Chelsea after having fallen down the pecking order at the club following the return of manager Jose Mourinho.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.