Pompey brought the curtain up on their third-tier campaign with a goalless draw against Shrewsbury on Saturday.
Kenny Jackett made one signing in the week before the game, with Callum Johnson arriving from Accrington for a fee of around £200,000 with add-ons.
But the Blues’ rivals also strengthened before the league season started – and will continue to do so before the transfer window shuts on October 16.
Here are all the deals that took place in the past seven days...
13. Ryan Broom: Cheltenham - Peterborough
One of two high-profile signings for the Posh. Broom had a superb season at Cheltenham last term and moved to London Road for an undisclosed fee. He signed a three-year deal. Photo: Pete Norton
14. Jonson Clarke-Harris: Bristol Rovers - Peterborough
The man who's surely joined the Posh as Ivan Toney's replacement. Clark-Harris had a prolific 18 months at Rovers and will now be looking to help fire Peterborough to the Championship Photo: Alex Burstow
15. Gavin Bazunu: Manchester City - Rochdale
The keeper makes the short switch to the Dale on a season-long loan. Photo: Charlotte Tattersall
16. Kelland Watts: Newcastle - Plymouth
The young defender will be a long way from home during his season-long loan at Home Park! Photo: Jordan Mansfield