I wouldn't be too worried. In fact, in one of his interviews yesterday, Gannon said he was surprised how good some of our youngsters were, and that they hadn't been more involved with the senior squad already.
I can't imagine he would have taken this job if he didn't have confidence in our youth set-up as he knows this is where a lot of the work will need to be done. For now, though, we also need to bring in a number of players to bolster the squad.