Here are some of the players who have either already been released, or are expected to be released, by their current clubs.
Some are players recommended by Posh fans. Former Posh players are among those listed.
1. ILMARI NASKANEN
Dashing right-sided wing-back released by Exeter City. Good player, but the Finn could well re-join his former manager Gary Caldwell at Wigan. Photo by Mark Sutton/Getty Images. Photo: Mark Sutton
2. JASON KERR (left)
A 29 year-old centre-back surprisingly released by Wigan Athletic after acting as club skipper last season. Made 37 of his 117 EFL appearances for Wigan last season. (Photo by Carl Recine/Getty Images). Photo: Carl Recine
3. BRENDAN GALLOWAY
If Posh want an experienced centre-back to replace Tom Lees, this former Everton defender is 30 and Plymouth Argyle have just released him. Galloway made 30 appearances for 'The Pilgrims' last season. (Photo by Harry Trump/Getty Images) Photo: Harry Trump
4. CALLUM WRIGHT (right)
A 25 year-old attacking midfielder who has also been released by Plymouth having spent last season impressing on loan at League One rivals Wigan Athletic. He scooped Wigan player-of-the-season awards and 'The Latics' are keen to sign him permanently. (Photo by Richard Pelham/Getty Images) Photo: Richard Pelham