A second-half goal from Brandao gave Marseillea 1-0 victory over a lacklustre Chelsea at the Stade Velodrome.
Brandao pounced nine minutes from time when a cross from Taye Taiwo was deflected into his path by Ramires and the Marseille striker tucked the ball home from six yards.
It was Chelsea's first defeat in Europe this season and the English champions looked well below par as their poor run continues.
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