The Brazilian was forced out of the 2-2 draw with Manchester City early on.
It would be a major blow were he to miss two months of the season, having been sorely missed for half of the last campaign.
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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.