Note: Flags indicate national team as has been defined under FIFA eligibility rules.

As part of their pre-season preparations, Peterborough United announced friendly matches against Bedford Town,[3] Stamford,[4] Gillingham,[5] Barnet,[3] double header with Oxford United,[3][6][7] Portsmouth,[3] Swindon Town[3] and King's Lynn Town.

Source: [citation needed] Peterborough United's fixtures were announced on 24 June 2021.

[14] Peterborough United were drawn at home to Bristol Rovers in the third round.

[15] Peterborough United were drawn at home to Plymouth Argyle in the first round.