Hailed as the Colchoneros' prodigal son upon returning to the club from Chelsea, the striker has suffered a dreadful drought in front of goal
Whatever one might have to say about Diego Costa's abrasive, borderline explosive character, there has seldom been doubt about his proficiency in and around the penalty area.
But as his painful drought continues the question must be raised: just what is going wrong for the Atletico Madrid favourite?
Costa made an instant impact at the Wanda Metropolitana at the start of 2018, as he sealed a move away from Chelsea amid a brutal falling-out with former boss Antonio Conte.