Diego Costa has been the most iconic player this season for Atletico Madrid, he is having a great season on the pitch and he will be one of the biggest names in the upcoming transfer market. Mourinho wants to bring him to Chelsea, the Blues have been pursuing him for quite some time. Atletico Madrid is however trying to keep him by the shores of the Manzanares river by offering to extend his contract. They are also looking to to protect themselves by increasing the exit clause in his contract. There will be devlopments coming weeks, when Atletico's season will be over.