He is an excellent prospect. So many times, you hear of players and they never match the hype when they are signed.
This guy is an extremely fast CB and young. The club in question is in absolute financial melt down. They would never dream of releasing unless the ship wasn't taking in heavy water. Has the potential to be one of the best CBs in Europe. He is a little arrogant however and needs more discipline. Physically and technically he is miles ahead of people his age. He can however get bored and will need the kind of training Vellios was exposed to at Everton as training in Greece is not exactly boot camp..
Either way, he should be worth around 3 mil minimum. AEK will sell for far less as they have no choice.