Koulibaly in terms of value should be the best CB in the world - He is still young, is very fast and strong and is really a great defender
Before you all start bashing me I said in terms of value which means Chiellini`s age reduces his value while Ramos isnt young anymore himself...
Looking at their current forum homepage I'll go with
'Tuz's favourite Juventus players'
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We need immediate starter top level CBs (Chiellini injury prone and older, Bonucci not reliable when Chiellini not with him), he might there there soon, but I'm not sure we are there yet with him. Its enough to have Rugani in that cathegory of promising young CB who isnt proven in taken reigns himself yet.