The Brazilian had just returned to action from a serious knee ligament injury that he suffered in the League Cup win at Chelsea in November 2011.
The midfielder sustained the thigh injury in the warm-up before last Sunday’s draw with Manchester City.
Lucas said on Twitter of his new injury: “No words to describe my feelings at the moment. It is been hard to be positive but I am sure better days will come. YNWA.”
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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.