The 23-year-old has undergone surgery to repair the anterior cruciate ligament in his right knee.
The young midfielder suffered the injury during training on October 23.
This is the second season that the Mexico international is part of the Barcelona first team.
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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.