A nice little short documentary/reportage about him. Seems like a really great guy as well.
A 100m move for prime years of a 27yr old CB isn't that bad an investment. I'd pay that in a heartbeat for a healthy dude like VVD and you'd get solid 6 years of elite defense. It's more to do with where he got with Napoli and where he hasn't yet been.
If what De Laurentiis said about past offers for Koulibaly are anywhere remotely accurate, he will cost more than 100 million euros. In particular as he is more sought after than Van Dijk was before he moved to Liverpool. Clubs usually spend such large sums of money on offensive players (younger too) and with such large sums involved a potential failure (an injury, lack of acclimatization, being the wrong fit etc.) is tremendously harmful. There are always risk involved but when you talk about 100 + million euros for a 27 year old defender (with nothing to show for on his CV other than great performances in the early stages of the CL and relatively frequently in a underperforming, even if less so than not long ago, Serie A) it's a whole other ball game.
I personally would prefer to play that sum of money for a 20 year old de Light.
Koulibaly will turn 28 this June, so 1 year older than the previously thought (for my part), 27 years.