Sky Bet are offering odds of 9/5 for Rochdale to take all three points at the ABAX Stadium on Saturday.
Posh are at 7/5, while the draw is 12/5.
Calvin Andrew, who scored Dale's opener in the 2-0 win over Peterborough at the Crown Oil Arena back in November, is at 13/2 to score first.
Top scorer Ian Henderson is available at 4/1 to break the deadlock, and is 6/1 to score a brace.
Odds correct at the time of writing. For a full a full list of match odds, click HERE.