Atletico Madrid striker Diego Costa has refused to open up about his reported move to Chelsea. The 25-year-old striker, who has been called up to represent his adopted country Spain at the World Cup this summer in his native Brazil has played down suggestions that a deal with Chelsea has already been agreed. Costa has been strongly linked with a summer move to English side Chelsea and some reports claimed that a 32m deal ahd been agreed at the weekend. However, the former Rayo Vallecano striker has chosen not to discuss his future, ahead of his side’s final La Liga match with Barcelona and Champions League final with Real Madrid.People say a lot of stupid things, Costa told Spanish daily Marca in an interview. Costa has been struggling with injury of late but is fully expected to face Barca in what is a title decider at the Nou Camp on Saturday afternoon.