City are set to give a debut to Gary Sawyer after his move from Plymouth.
Lewin Nyatanga (Achilles) is out, while Marvin Elliott is struggling with a knock and faces a fitness test.
MATCH PREVIEW Already braced for a return to League One, Peterborough are also facing the prospect of finding a new manager after Jim Gannon this week made it clear that he will not be staying at London Road beyond the end of the season.
Millen expecting Peterborough reaction
Saturday's fixture will be Gannon's 200th league match as a manager in England and Scotland. It will also be a chance for Posh, bottom of the table and having lost their last three games, to claim what would be only their eighth Championship victory.
They face a Bristol City side that won 5-3 at home to Barnsley in a thrilling match on Tuesday night. It was the Robins' first win in four and a welcome boost following a dismal recent run.
But City have found goals hard to come by away from home. They have failed to score in five of their last seven league games on the road, and have won only one of their last nine away matches.
MATCH FACTS Head-to-head
• Bristol City have not lost in 11 league and cup meetings with Peterborough (W9, D2).
Have your say on this match • The Robins are looking for a fourth successive league victory at London Road.
• Posh have not beaten City since a 4-1 home victory in September 2001.
• Peterborough have suffered an unparalleled 23 Championship defeats this season, 11 of which have been since the turn of 2010.
• They have scored eight goals in 2010 - fewer than any other side in the division.
• Craig Mackail-Smith is hoping to make his 150th appearance for Posh.
• City have won three of their last 14 league matches and have drawn 16 of their 39 Championship fixtures this season. Only Ipswich have drawn more.
• Striker Nicky Maynward has had 62 shots on target this term -more than any other player in the division.
• If selected, Marvin Elliott will be making his 250th career league appearance.
MOST RECENT MEETING Bristol City 1-1 Peterborough (17 October 2009)
Bristol City scorer: Skuse 31.
Peterborough scorer: Boyd 90.