Atletico Madrid president Enrique Cerezo says Rojiblancos can plan a return move for Chelsea striker Diego Costa.
"We have a great relationship with our former players," Cerezo told Spanish radio station Cope.
"Diego is a great player, but a Chelsea player. We will try and do our best and see what Chelsea says, but it does not depend on us."
Costa scored 43 goals in 90 appearances while he was at the Vicente Calderón stadium.