Guy Whittingham insists his central defensive pool possesses the experience to succeed in League Two.
The Blues boss has Sonny Bradley, Joe Devera and Adam Webster fighting it out to line-up in the heart of his back four.
But the ages of Bradley, 21, and Webster, now 18, is raising concerns over their maturity.
In the meantime, there is still nothing definitively happening with veterans Ricardo Rocha or Sam Sodje, who remain on the backburner.
Whittingham is unconcerned by his youthful options, though.
And he believes the trio have more than enough to cope.
He said: ‘We have got Joe Devera, who is pretty experienced.
‘He has won the league we are in and got to the play-off finals with Swindon last season.
‘We also have Sonny Bradley, who has played a whole season in this league (with Aldershot), so I think we have enough experience in that league at the back.
‘Of course you also have Adam Webster, who really needs to make his mark in football now.
‘And I hope he comes back with the determination to do so because we need competition for places.
‘Really, we are almost covered in that position for pure centre halves.
‘I suppose you could look at Adam and Joe and maybe think they could play full-back but that is not really where I want them to play.
‘I want three of them competing for centre half spots.
‘On the other hand, Ric and Sam are not experienced in League Two – whereas two of our defenders are.
‘What we have tried to do is get people experienced in the league, especially with game time and especially with winning the league.
‘Between the two of them (Devera and Bradley) we have.’