Even if he can, we don`t need to force feed players positions anymore. Right now, we already have Retsos that is a CB and can play RB, and he is much better than Hatzidiakos. Vs Croatia, we had Maniatis, Zeca and Retsos playing out of position, and although 2/3 fared pretty well individually, all things considered, the team was in shambles. This isnt a sustainable solution and we need to start developing and playing guys in their natural positions.
All that said, in Retsos' case, if he is truly our best option at RB right now, then he should start in that position, also considering he has three bulls in front of him in the CB pecking order. He is an exception rather than the rule.