Your whole post makes very little sense. You call Benatia our most injury prone player which is simply untrue. You wrote we can buy any defender in the world for less than 18mln which is also laughable. I wouldn't call Benatia 5th CB as Chiellini and Barzagli miss a lot of games. Bonnucci and Rugani have also been injured this season. Adding the fact that defenders tend to receive more cards than other positions on the field gives you an answer why we need Benatia.
Lets see.
"You call Benatia our most injury prone player which is simply untrue"
Yes it is true. Benatia's career has been plagued by injuries.
"You wrote we can buy any defender in the world for less than 18mln which is also laughable"
No its not laughable, its true, and I said
almost. We pretty much never paid that much for a CB. We signed Caldara this year for less, Rugani for less, Ogbonna for less, Barzagli for less, Caceres for less, Chiellini for less, etc, etc, etc.
"I wouldn't call Benatia 5th CB as Chiellini and Barzagli miss a lot of games. Bonnucci and Rugani have also been injured this season"
That doesn't mean he is not our 5th CB.
What's the point?
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nah, just take a look at Chelsea's summer trying to buy every big name CB there is in Serie A and going for 30m David Luiz in the end, 18m is cheap nowadays whether it's for a quality defender or midfielder. I'm just not sure Benatia is still the quality CB he was at Roma, he's been a shadow of his former self past few years
But we are not Chelsea. We don't behave like them in the transfer market (and shouldn't). The tried to sign established CBs from the top teams, when is the last time we did that? we are not gonna sign Koulibaly or Manolas. Specially not for depth. If its not gonna even be our first sub, let alone second sub, then 18m is too much.
We signed Caldara and Rugani for something like 20m total. Barzagli almost free. Chiellini and Bonucci relatively cheap. Caceres and Peluso cheap. These are the kind of deals we need to fill in the gaps, not to blow a big part of our budget.