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:
13. 12th - Accrington Stanley
Once again in the thick of it at the top of the table, Accrington are being tipped to challenge - but have struggled for results of late and may just miss out on the play-offs. Predicted points total: 66 Photo: Clive Brunskill
14. 11th - Gillingham
Steve Evans again has his side competing in the top half of the table this season, and the Gills are being backed to maintain that position in the final weeks. Predicted points total: 67 Photo: Dan Mullan
15. 10th - Charlton Athletic
The Addicks made some eye-catching signings in the winter window, but their form of late has been mixed. The experts don't think the arrival of Nigel Adkins will lead to a play-off place, though.. Predicted points total: 67 Photo: Jacques Feeney
16. 9th - Oxford United
The U's have hit a fine vein of form of late, and are being backed to remain in the upper echelons of the table in the final few weeks. Predicted points total: 69 Photo: Alex Burstow