It seems to me that to a large extent he's relying on those of last seasons regular first team players that were retained or are on ongoing contract, plus others that he's brought in. No doubt he sees the fringe players and reserve players train and assesses their abilities accordingly, but given the experience that Essam in particular gained from playing regularly for the first team in the run in at the end of last season I am surprised that he's not willing to give some of the younger players a chance.
With the yellow and red cards beginning to mount up their chance might come sooner rather than later.
Also I presume that all of these loan deals will have a call back clause, just in case a crisis arises, so on that basis it probably is better for them to get regular first team experience, even if at a lower level as that will still be a better test than playing in the reserves.