Romeu went off in the 3-1 win over Sunderland at the weekend with the injury.
He has now undergone anterior cruciate reconstruction surgery and medial meniscus repair to fix the 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.