I am from Greece and I know him how he plays for 5-6 years.
He is at stones's level but very different profile, a lot different player. He is a beast defensively but has sometimes his moments (weird ,silly) like otamendi or stones but a lot less times than otamendi.
At the national team he plays next to Papastathopoulos.
One of the best CB of serie a. I can't understand how he didn't move to better and more stable team than Roma yet.
At 35 million , we get the better deal. His price is more than that.