The prospect of a second trip to Wembley in 12 months is an enticing one, but, unusually, Posh also find themselves in the thick of a relegation fight and they have a crunch game at home to fellow strugglers Shrewsbury Town on Saturday.
The PT is in no doubt which game is more important so here is our Posh team for the semi-final against a powerful side who remain favourites for promotion to the Championship at the end of this season.
Kwame Poku, Gustav Lindgren and Jadel Katongo are not expected to return from injury until the weekend, while Sam Hughes and Tayo Edun are cup-tied, and Carl Johnston is injured and cup-tied! Ricky-Jade Jones could be a doubt with a back problem.
Our team has been picked in a 4-2-3-1 formation...
9. CIAN HAYES
Posh have plenty of options up front. Hayes can keep his place on the right for this game with Kwame Poku on the verge of a return to action. Photo: David Lowndes
10. BRAD IHIONVIEN
This centre-forward's physicality could come in handy against powerful centre-backs. He doesn't have the explosive pace of Ricky-Jade Jones or Malik Mothersille, but he will win more headers and hold the ball up better. His one League One start for Posh was at Wrexham and he will be hungry to prove he should play more often. Photo: Joe Dent
11. ABRAHAM ODOH
The left winger is the third player in our team to keep their place from Saturday, after Dornelly and Hayes. He was good at Huddersfield whereas Mothersille and Jones looked like they needed a rest. Jones has a back issue anyway so probably won't be risked. Photo: David Lowndes
12. THE SUBS
Wallin (pictured), Will Blackmore, Mothersille, O'Brien-Brady, Collins, Kyprianou, Jones (if fit, if not Kamara). Photo: Joe Dent