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The Chelsea squad reported for preseason training but Chelsea striker Diego Costa failed to turn up for preseason training.

According to a report on Daily Mail, Costa was excused from preseason training by Chelsea as he attempts to complete a transfer back to Atletico Madrid.

The report claims Costa’s representatives agreed an extension to his summer break as he tries to strike a deal to move away from Stamford Bridge.

Costa reportedly wants to return to Atletico Madrid but Chelsea and Atletico are yet to agree on the valuation of the 28-year-old Spain international, who has two years left on his contract.

With Costa set to leave Chelsea and Lukaku opting to join Manchester United, Chelsea boss Antonio Conte would be hoping Chelsea make progress in the pursuit of Real Madrid striker Alvaro Morata.