Pompey will face stern competition in the race for promotion, with a number of their third tier rivals having already completed some eye-catching deals – which could prompt some worry. Scroll down and click through the pages to see EVERY deal completed in League One this summer so far:
5. Bristol Rovers
In: Mark Little (Bolton), Jordi Van Stappershoef (FC Volendam), Josh Hare (Eastleigh), Tom Davies (Coventry City), Anssi Jaakkola (Reading - loan)
Out: Chris Lines (Northampton), Stuart Sinclair (Walsall), James Clarke (Walsall), Tom Lockyer (Charlton Athletic), Stefan Payne (Tranmere Rovers), Adam Smith (Forest Green), Daniel Leadbitter (Newport County) Photo: Pete Norton
6. Burton Albion
In: John-Joe O’Toole (Northampton), Jevan Anderson (Formartine United), Richard Nartey (Chelsea - loan), Kieran O’Hara (Manchester United - loan)
Out: Kyle McFadzean (Coventry City), Jamie Allan (Coventry City) Photo: Nathan Stirk
7. Bury
In: None
Out: Sam Allardyce (Oxford United), Scott Burgess (Port Vale), Nicky Adams (Northampton Town), Joe Murphy (Shrewsbury Town), Will Aimson (Plymouth Argyle), Nicky Maynard (Mansfield Town), Chris Stokes (Stevenage), Danny Mayor (Plymouth Argyle), Tom Aldred (Brisbane Roar) Photo: Lynne Cameron
8. Coventry CIty
In: Kyle McFadzean (Burton Albion), Marko Marosi (Doncaster), Ben Wilson (Bradford), Fankaty Dabo (Chelsea), Josh Pask (West Ham), Wesley Jobello (Ajaccio), Jamie Allan (Burton Albion), Gervane Kastaneer (NAC Breda)
Out: Tom Davies (Bristol Rovers), Lee Burge (Sunderland) Photo: Alex Pantling