But how have the rest of League One been faring in these financially difficult times?
Here we list the arrivals and departures of the clubs who will try and stop Posh winning an immediate return to the Championship. We also rate their transfer business out of 10.
All transfers logged by the BBC from the end of last season and up to and including June 30.
Departures listed are those who have found new clubs.
All transfers logged by the BBC from the end of last season and up to and including June 30.
11. FLEETWOOD TOWN
Ins: Shaun Rooney (St Johnstone), Josh Vela (Shrewsbury), Jay Lynch (Rochdale), Brendan Wiredu (Colchester), Callum Morton (West Brom, pictured, left), Josh Earl (Preston)
Outs: Harrison Biggins (Doncaster), Jordan Rossiter (Bristol Rovers). Summary: The Cod Army look set to have a better squad next season after their final day escape from relegation in 2021-22. Set-piece specialist, and former Posh defender, Danny Andrew signing a new two-year deal was important. Transfer business rating: 7/10. Photo: Joe Dent
12. FOREST GREEN ROVERS
Ins: Corey O'Keefe (Rochdale), Armani Little (Torquay), Kyle McAllister (St Mirren), David Davis (Shrewsbury), Alfie Burnett (Rotherham), Harry Boyes (Sheff Utd), Reece Brown (Huddersfield, pictured). Outs: Ebou Adams (Cardiff), Jake Young (Bradford City), Kane Wilson (Bristol City), Dan Sweeney (Stevenage), Taylor Allen (Walsall). Summary: The controversial departure of manager Rob Edwards hasn't stopped the League Two champions from an active transfer window. Ex-Posh player Reece Brown should be a good signing. Ian Burchnall from Notts County is the new manager. Transfer business rating: 7/10. Photo: Joe Dent