And the changes worked wonders as Posh delivered a superb second-half showing to reach the last 16 of a competition which has a Wembley final as a prize.
There were some excellent marks for the players and the manager.
Ratings key: 10-Perfect, 9-Outstanding, 8-Very Good, 7-Good, 6-Okay, 5-Poor, 4-Very Poor, 3-Drreadful.
5.
IDRIS KANU: Played with power and pace down the right, He was a constant attacking menace. Set the crucial first goal up and would have had a hat-trick of assists with better finishing from Eisa 8.
6.
HARRISON BURROWS: Played with energy and spirit down the left. Passed the ball well under pressure 7.
8.
ETHAN HAMILTON: An outstanding midfield performance full of power, tough tackling and hard running. His passing was decent as well. He's one fit, athletic footballer 9.