The 26-year-old picked up a cruciate knee ligament injury during Saturday’s draw with Burnley.
Cohen has been told that the injury will see him miss the rest of the season.
The defender sustained a knee problem in 2011 which kep him out for 11 months, but this injury is not a reoccurrence of that problem.
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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.