Chelsea have suffered a major setback in the race to sign Atletico Madrid star Diego Costa, according to talkSPORT.
Jose Mourinho has identified Costa as the man to ease his side's striking problems but have been told by Atletico Madrid that he will not be leaving the La Liga club in the summer.
The Portuguese tactician failed to entice Manchester United's Wayne Rooney away from Old Trafford in the summer, so has switched his attention away from the Red Devils star to Costa.
It was originally thought that Mourinho would use Thibaut Courtois as a sweetener to land one of Europe's top strikers in the summer.
However Atletico Madrid president Enrique Cerezo has ruled out the chance of Costa leaving the Vicente Calderón Stadium at the end of the season.
Speaking to talkSPORT: "Diego Costa is an Atletico player and will remain with us for a long time."
Costa, who is said to be valued at €35million, has scored 21 league goals in 23 games for Atletico Madrid so far this season.
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