Eighteen signings have been made by third tier clubs in the last seven days including the arrivals of Ronnie Edwards and Ethan Hamilton at Posh.
Charlton Athletic have made their first two signings of the summer after overcoming ownership issues which leaves just Ipswich Town and Wigan Athletic as the only clubs yet to announce a new player, although the Tractor Boys are close to unveiling goalkeeper David Cornell, full-back Stephen Ward and forward Oli Hawkins.
Among those to move out of League One include former Posh player Kieran Sadlier who has joined Championship outfit Rotherham United.
Among those to move into the third tier is a former Posh hotshot.
Here are the top League One signings of the week...
9.
CONOR WASHINGTON (Charlton): The former Posh striker tore up League One the last time he played in the third tier, scoring 15 goals for Graham Westley's team before being sold to QPR for £2.5 million in January 2016. He's suffered some lean years since but also made his international debut for Northern Ireland. Last season he managed four goals for Hearts who were relegated from the Scottish Premier League. Photo: Joe Dent/theposh.com. Photo: Midlands
10.
ADAM JACKSON (Lincoln): Four goals in 22 appearances for Scottish Premier Division side Hibs last season suggests this former England youth international centre-back should cope comfortably with League One. Photo: Getty Images.