Richie Barker believes he needs to increase the size of his existing squad to cope with the push towards League Two safety.
As it stands Pompey have a 22-man first-team set-up.
That does not take into account youngsters Ashley Harris, Adam Webster and Jack Whatmough.
Yet of that 22, Dan Butler, Tom Craddock, Simon Ferry, Shaun Cooper and Andy Barcham are all currently out injured and likely to miss the next few games at least.
As a result, Jack Maloney was called up to the match-day 18 for yesterday’s goalless draw with Northampton.
And Barker is desperate to bring in greater numbers to choose from.
He said: ‘I have not totally decided who is staying but I am on the way – I have an idea of where I need to be.
‘I would like to get a few in and we need help for numbers for a start because we can hardly fill the bench.
‘There was a development player on the bench yesterday (Maloney), two if you include Ash (Harris).
‘I know he has been in and around the first-team but we are going to need numbers to start with.
‘That is not that much manoeuvring but I knew what it was when I took the job and it’s not what people think, it’s a tough one.’
Trevor Carson remains the first decision Barker will have to make.
And the boss plans to talk to the keeper’s parent club, Bury, after his final appearance on New Year’s Day against Southend.
He added: ‘Trevor has one more game left and that is a conversation I need to have with Bury in the next couple of days.
‘I have made up my mind-ish.’