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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.