But the other League One clubs have made 52 signings since the window opened on January 2, mostly on loan.
Former Liverpool and Manchester United players are among those to move into League One, including a midfielder who was valued at £8 million three years ago.
Ex-Posh players have also been on the move including Paul Coutts who has surprisingly dropped into Division Two after switching from Fleetwood to Salford City.
The transfer window closes at 11pm on February 1.
Here are the best of the League One signings so far...
Ex-Posh players have also been on the move including Paul Coutts who has surprisingly dropped into Division Two after switching from Fleetwood to Salford City.
5.
ZACH CLOUGH (Forest to Wigan, free) & JANOI DONACIEN (Ipswich to Fleetwood, loan): Clough (right) and Donacien played against each other in a 0-0 draw at the weekend. It was a debut for both. Forward Clough was a star at Bolton in his early days, while right-back Donacien's departure wasn't well received by some Portman Road. (Photo by Jan Kruger/Getty Images). Photo: Getty Images Europe
6.
OLLY LEE (Hearts to Gillingham loan): It's a third spell on loan at the Gills for Rob Lee's son, a busy attacking midfielder. (Photo by BEN STANSALL/AFP via Getty Images). Photo: AFP
7.
KYLE VASSELL: (Rotherham to Fleetwood, loan): A former Posh striker signed to rescue the Cod Army's floundering season. Photo: Getty Images. Photo: Getty Images Europe
8.
GARY ROBERTS (Bala Town to Accrington, free): This 36 year-old wide player was terrific in his younger days. Played for Wigan at the start of this season. (Photo by Harry Murph y/Getty Images). Photo: Getty Images Europe