Diego Costa is unsettled at Chelsea.Marca says the Spain striker is unhappy in London and keen to return to Atletico Madrid.

The centre-forward only joined Chelsea last summer and while he's enjoyed his time with his teammates and the football in England, he can't hack the climate, nor the food!

Costa has instructed his agent to ask Atletico about buying him back this summer.

But Chelsea will be reluctant to lose the centre-forward, particularly with Didier Drogba leaving this summer.