Antonio Conte's pre-season preparations with Chelsea have just suffered a huge blow, with Diego Costa telling the Blues boss he wants to leave.
The Spain international, who was under par last season, scoring just 12 Premier League goals, has been linked with a move back to his old club Atletico Madrid.
And according to AS, the 27-year-old has now informed both Conte and Chelsea owner Roman Abramovich of his intention to head back to La Liga.
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Costa wants out
The player hasn't felt the need to make a public statement, but the same source suggests that there is no need, as the club's hierarchy are all well aware of Costa's feelings.
Atleti boss Diego Simeone has made signing Costa one of his priorities this summer, and he could link up with Fernando Torres up front next season.
Chelsea are currently in Austria to face Rapid Vienna in their first friendly of the pre-season, but Conte may quickly have to turn his attention back to the transfer market.
Conte needs options
The Blues have already brought in one striker in the form of Michy Batshuayi from Marseille, but he was not intended to be a replacement for Costa.
Alvaro Morata was believed to be one option, but it appears he is now staying at Real Madrid, which means Chelsea need to start considering other alternatives.
Costa failed to make Spain's Euro 2016 squad because of Vincente del Bosque's concerns about his fitness, so he could certainly do with a fresh start.
Should Chelsea sell Diego Costa? Have your say in the comments.