The striker has spent more time in the Colchoneros' colours in pre-season, but the club are guarded over a possible deal happening
Atletico Madrid president Enrique Cerezo has attempted to play down an imminent swoop for Chelsea striker Diego Costa.
Spain international Costa is surplus to requirements at Stamford Bridge, despite firing the Blues to the Premier League title with 20 goals in 35 games last season, while he and Antonio Conte were reported to have fallen out over Chelsea's refusal to sanction a move to China last term, with relations soured further by the Italian informing Costa he could leave via text message.