Chelsea could be without Belgian superstar Eden Hazard for the Premier League visit of fellow top-four side West Ham United on Boxing Day.
The 23-year-old was withdrawn in stoppage time against Stoke City on Monday night after some hefty challenges and might not be risked against the Hammers.
Hazard has started all 17 of the league leaders' games so far this season, scoring six goals.
If he does sit out, Oscar is likely to earn a recall to the starting XI for the lunchtime kickoff at Stamford Bridge in two days' time.
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