Guy Whittingham believes Pompey’s youngsters possess the character to cope with their first-team elevation.
Jed Wallace and Dan Butler have both been promoted to the Blues’ senior squad in the past month.
The teenage duo had been pencilled in to start against Notts County, only for the match to be postponed because of a waterlogged pitch.
They were both also in the frame to line up against Scunthorpe last week – until the snow intervened.
Adam Webster and Ashley Harris have been long-time members of the senior set-up.
Additionally, Republic of Ireland under-19 international Frankie Sutherland has now arrived at Fratton Park on loan from QPR.
For Whittingham, it is crucial any youngster can cope in the pressure situation of a first-team match.
His squad certainly have a youthful tinge to it at present but he is confident they can perform.
He said: ‘What you have to do is have a look at the young players and give them a go to see if they are good enough.
‘But you have to be very careful with that because you have to make sure they are the right character to do that.
‘Their character is really important. If they come in and play half-a-dozen games and don’t do very well, you might destroy them.
‘You have got to make sure their character is good – and you have to be pretty sure they will be able to cope with the ups and downs of football.
‘I’m confident our lads will be able to do that.’
Meanwhile, Pompey are hoping to finalise the loan deal for Adam Reed within the next 48 hours.
The Sunderland midfielder will sign for an initial month at Fratton Park.