The loss means that their lead at the top of the table is just three points.
Carlo Ancelotti’s side face third placed Marseille next weekend, just five points clear of them.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.