Bristol City caretaker manager Steve Wigley has a number of injury worries ahead of the game.
Defenders Ryan McGivern (hamstring) and James Wilson are doubts for the fixture and will be assessed on Friday, while veteran centre-back Louis Carey is unlikely to play any part because of a knee problem.
Long-term casualty Liam Fontaine is on his way back to full fitness and is now taking part in training, but the defender is still a week away from a complete recovery from his ankle injury.
Jamie McAllister remains sidelined, also with an ankle complaint, and is still three weeks from a comeback.
Wigley will take charge of the City team on matchday after chairman Colin Sexstone revealed the club will not be appointing a new manager until at least next week.
Lee Tomlin could make a surprise return for Posh.
Tomlin was expected to be absent until the end of the month after damaging ankle ligaments in the 1-0 defeat at West Ham on September 24 but the 22 year-old forward has trained this week.
"Lee has been running, twisting and turning and to be honest he's looked pretty good," said manager Darren Ferguson, who along with assistant Kevin Russell will serve a touchline ban on Saturday after being charged with improper conduct by the Football Association. "If he comes through okay he will definitely travel with the squad.
"Hopefully the break will have done him good. He's a player you miss when he's not in the side so it will be great to have him back."
Ferguson also expects to have centre-back Gaby Zakuani (toe) and midfielder Grant McCann (groin) available, while central defender Ryan Bennett has returned from England Under-21 duty unscathed.
David Ball could also be in the squad after the striker was recalled from his loan spell at Rochdale during the international break.