Costa, 25, is a top transfer target for manager Jose Mourinho as he looks to reinvigorate his strike force at Stamford Bridge.
The Brazil-born forward, currently back in the country of his birth to represent defending champions Spain at the World Cup, completed a medical before leaving Europe for the tournament, which kicks off on Thursday.
When asked if he was going to join Chelsea in a telephone interview with Spanish radio station Cadena Cope, Costa replied: “Well, it could be.”
Meanwhile, Spain coach Vicente del Bosque said that he hopes the selection of Costa will not provoke any more animosity towards the Spain national side from the Brazilian public.
Costa played in two friendlies for the World Cup hosts last year, but made the switch to his adopted country after taking Spanish nationality last season.
“During the Confederations Cup they were against us. We’re considered rivals to Brazil, so it’s a normal reaction,” he said an interview published in German newspaper Welt am Sonntag.
“There will be moments when our rivalry will mean we aren’t exactly loved in Brazil, but in general, I don’t think it will be any worse because he is playing for us.
“He decided to take up citizenship and play for us. He achieved a lot with his club this season with his goals, his fight and enthusiasm. A player with these characteristics isn’t exactly a bad thing for us”.
Written by Steve Milne
