Diego Costa could reportedly face a month on the sidelines after suffering a thigh injury against Juventus on Saturday.
In an update via their official website on Tuesday, Atletico Madrid confirmed the striker had suffered "a muscle injury in the adductors of the left thigh" and had undergone an MRI scan to determine the extent of the problem.
Football Espana reported the injury could keep him out for a month.
Costa would have missed their opening game of the campaign against Getafe anyway, as he will be serving the final match of an eight-game suspension he was handed last season for insulting a referee.