Steve Cotterill has urged Pompey’s youngsters to make the most of their loan arrangements.
Lewis Tallack and Lewis Stockford have both joined Blue Square South sides for a month.
Right-back Tallack has made the switch to Dorchester, while midfielder Stockford is at Salisbury City.
The youngsters represent the sole players taken on as Fratton first-year professionals last season.
The home-grown players have already tasted Pompey first-team action in the form of several friendlies this season.
Now Cotterill wants to see them prosper out on loan.
And he believes such temporary spells away from Fratton Park are crucial to their development.
He said: ‘Andy Awford asked me at the end of last season if he could get the pair of them out on loan because sometimes lads can develop late.
‘This season they have come in, they’ve done well, they’ve been over to Betis with us and probably learned a lesson with everybody else in those games.
‘But I think it’s a big jump for them.
‘They need to go out and play. They need to put themselves on show.
‘So go out on loan and then we will see.
‘Last year a couple of the young lads (Ellis Martin and Perry Ryan) turned down the opportunity to go to Salisbury.
‘At the end of the day, though, they have got to play.
‘They can stay here and if they don’t play for the youth team what are they going to do?
‘You are going to train every week and then have the weekend off.
‘I suppose it’s not a bad job but it only last 12 months.
‘These lads need to play games.’
The 18-year olds are both local youngsters.
Tallack, from Waterlooville, is a former Crookhorn Community School pupil.
Meanwhile, Stockford attended Priory School in Southsea.
In recent years, the likes of local talents Joel Ward, Matt Ritchie and Marlon Pack have graduated into the Blues first team.