BBC Sport - Middlesbrough 0-1 Chelsea: One mistake punished Boro - Karanka

One mistake punished Middlesbrough - Karanka

Middlesbrough manager Aitor Karanka says his team showed they can compete with the best after they lost 1-0 at home to Chelsea, with "one mistake" that led to Diego Costa's goal the only difference between the sides.

MATCH REPORT: Middlesbrough 0-1 Chelsea

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