Pritchard, who moved to London Road from Tottenham on transfer deadline-day at the end of last month, is nursing a knock following Posh's 2-1 home win over Leicester on Saturday.
He will undergo an X-ray on the ankle on Tuesday when Peterborough's medical team will decide on the best course of action.
Pritchard is on loan with Darren Ferguson's side until the end of the season.
The 20-year-old has impressed for Spurs' youth and reserve sides but has yet to make a first-team appearance for the Barclays Premier League club.
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