Posh have looked likes serious contenders for an automatic promotion spot all campaign, but their hopes suffered a serious blow when they lost 3-1 to in-form Blackpool on Tuesday night.
That result means they are still second in the table, but Sunderland have a crucial game in hand that would now take them above United, should they win it.
But where do the experts think Peterborough will finish, and who are they tipping for promotion to the Championship?
One set of data analysts have released their latest predictions on how the League One table will finish - and it makes for interesting reading after a busy period in the division, which has seen a number of teams drop points.
Scroll down and click through the pages as we see where their unique formula is predicting Posh to finish come the end of the 2020/21 campaign:
21. 4th - Blackpool
The Seasiders are being tipped to storm up the table in the final weeks of the season, and a charge into the play-offs may be on the cards according to the experts. Predicted points total: 76 Photo: Alex Livesey
22. 3rd - Peterborough United
They've been in good form of late, but the experts believe Posh will just miss out on the automatic promotion places after losing to Blackpool on Tuesday night. Predicted points total: 83 Photo: Alex Pantling
23. 2nd - Sunderland
The Black Cats, whose quartet of January signings - and new billionaire owner - are expected to help the club secure a top two place. Predicted points total: 85 Photo: FRANK REID 2019
24. 1st - Hull City
In and around the top two for most of the campaign, Hull are being backed to return to the Championship at the first time of asking. Predicted points total: 88 Photo: George Wood