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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.