We won't play 5 keepers in the group stage, probably only a max of 6-7 defenders aswell. I know why Martinelli has been left out & I'd presume he'd make it in the next one if we make it into the finals. I'd still certainly play an extra midfielder/attacker before an extra defender. I'd at least leave out either Hillson or Iliev, neither will get a run, probably not even the group stage.
We probably just needed to fill squad space, no biggy. Not like we're missing any big names from the squad who are in the long term plan.