Posh won a penalty shootout 4-1 after the tie had finished 1-1 after 90 minutes.
The game featured a first Posh goal for Joel Randall and a dynamic substitute display from Jeando Fuchs.
Ratings Key: 10-Brilliant, 9-Outstanding, 8-Very good, 7-Good, 6-Okay, 5-Poor, 4-Very poor.
9. KWAME POKU
He was way off the pace for the most part. One fine block of a shot just before the break and one excellent pass at the start of the second-half that set Ricky-Jade Jones free couldn't save him from the hook - 5. Photo: Joe Dent/theposh.com
10. KABONGO TSHIMANGA
Taken off at half-time after Posh had struggled to hold the ball up in forward areas. One neat header presented Randall with a shooting chance, but Clarke-Harris will be back in the side at the weekend - 5. Photo: Joe Dent
11. RICKY-JADE JONES
Played a strong part in the early Posh goal with a decent pass to scorer Randall and denied a goal soon after half-time by a good save after a powerful surge into the penalty area, but often looked clumsy in possession - 6. Photo: David Lowndes
12. DAVID AJIBOYE (for Tshimanga, 46 mins)
The half-time substitute started on the left-wing and finished as a right wing-back. Played with great spirit, but inconsistent accuracy - 6. Photo: Joe Dent