Diego Costa is unhappy at Chelsea according to a report carried by a major Spanish newspaper website, with the rainy weather, language barrier and food leaving the striker keen on a return to Atletico Madrid.

The Brazil-born Spain international only moved to Stamford Bridge from the Spanish capital last summer and on the pitch has been quick to make an impact. Despite suffering a series of injury set-backs, he still managed to notch 20 goals in the Premier League.

However, according to Spanish newspaper Marca, Costa is keen on a return to Spain having failed to settle in London. It's even suggested that Atletico Madrid manager Diego Simeone has been in contact with the 26-year-old in a bid to convince him to return to the club with which he won La Liga a year ago.

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