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The 23-year-old - who is on loan at the Britannia Stadium from Chelsea - sustained the problem during Saturday's 2-1 home defeat to Burnley in the Premier League and is now likely to be sidelined until the new year.
"He has a significant thigh injury which is likely to keep him out for several weeks," said assistant manager Mark Bowen.
"Marc trained on Tuesday, albeit lightly, but he trained and will have more intensive training later in the week and hopefully he'll be available at the weekend," added Bowen.
