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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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.