In the first three days of the window, the Blues confirmed the signing of five players - with three joining on the opening day of the market.
So far, Will Norris, Conor Shaughnessy, Christian Saydee, Terry Devlin and Anthony Scully have penned deals at Fratton Park, while Reeco Hackett made a permanent move to Lincoln.
With five new faces through the doors at PO4, who are the most valuable players in John Mousinho’s squad.
We’ve taken a look at Transfermarkt’s estimated market values for the 20 players currently in the Blues boss’ ranks.
. Estimated player values
From left: Will Norris, Anthony Scully, Joe Morrell, Connor Ogilvie. Photo: National World
. Liam Vincent
Estimated market value: £43,000. Photo: Jason Brown
. Harry Jewitt-White
Estimated market value: £85,000. Photo: Jason Brown
. Haji Mnoga
Estimated market value: £85,000. Photo: Malcolm Bryce
. Terry Devlin
Estimated market value: £129,000. Photo: Portsmouth FC
. Tom Lowery
Estimated market value: £129,000. Photo: Jason Brown
. Denver Hume
Estimated market value: £170,000. Photo: Jason Brown
1. Estimated player values
From left: Will Norris, Anthony Scully, Joe Morrell, Connor Ogilvie. Photo: National World
2. Liam Vincent
Estimated market value: £43,000. Photo: Jason Brown
3. Harry Jewitt-White
Estimated market value: £85,000. Photo: Jason Brown
4. Haji Mnoga
Estimated market value: £85,000. Photo: Malcolm Bryce