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.
9. Sheffield United 2, Posh 3 2016.
A stunning individual goal from Martin Samuelsen (pictured) completed a thrilling win at Bramall Lane. Conor Washington and Erhun Oztumer also scored. Posh also won 2-1 in Sheffield the season before with goals in the final three minutes from Jack Payne and Washington. Photo: Joe Dent
10. Posh 3, Sunderland 0, 2019
Marcus Maddison (pictured celebrating in front of happy fans) scored twice and Josh Knight also netted as Posh went 3-0 up before Sunderland were reduced to nine men at London Road. Photo: Joe Dent
11. Posh 3, Sunderland 0, 2019.
Josh Knight scores the final goal in that handsome win over Sunderland. Photo: Joe Dent
12. Ipswich 1, Posh 4, 2020.
Posh stunned Portman Road with two goals from current Ipswich player Sammie Szmodics and strikes from Ivan Toney (penalty) and Siriki Dembele. All three are pictured celebrating a Szmodics goal. Posh completed a League One double over the Tractor Boys the following season. Photo: Joe Dent