Birmingham City became odds on favourites at 8/11 with Sky Bet after their recent win over Wrexham.
They are a big club by League One standards and they’ve flexed some serious financial muscle following their relegation from the Championship last season.
But it’s nothing Posh haven’t faced, and beaten, before at this level in the Darragh MacAnthony/Darren Ferguson eras. Here are some of the most memorable wins against the big boys in League One.
5. Posh 5, Sheffield Wednesday 3, 2011.
Craig Mackail-Smith slides in to score for Posh against the Owls. Photo: Georgi Mabee
6. Sheffield Wednesday 1, Posh 4, 2011
And Posh won 4-1 at Hillsborough a month later on their way to promotion via the play-offs. The goals that night were scored by George Boyd (2, pictured)), Craig Mackail-Smith and Lee Tomlin. Photo: PT
7. Posh 1, Wolves 0, 2013.
Wolves had suffered back-to-back relegations from the Premier League into League One and they ended up accumulating 103 points on the way to a third tier title they celebrated with an open-top bus tour around the city! But not before a Michael Bostwick goal direct from a free kick 11 minutes from time had seen Posh beat them 1-0 at London Road. Photo: david lowndes
8. Posh 1, Wolves 0, 2013.
MIchael Bostwick celebrates his winning goal for Posh against Wolves. Photo: david lowndes