Player :Nicolas Otamandi
My team: Arsenal
Team Selling : FC Porto
Offer: 17m usd
Season :2012 march
Other Info:Money not a Problem, Need 2 central back potential to become world class player ,age under 25 , any intro?
Nicolas Otamandi
Benedikt Howedes
Neven Subotic
Mat Hummels
Simon Kjaer
Alvaro Dominguez
Sebastian Toro
Kara
Mamadou Sakho
Jonathan Mensah
Dedryck Boyata
Nicola Nkoulou
Ezequiel Munoz
Mateo Mussachio
kyriakos Papadopoulos
Siyanda Xulu
Raphael Varane
Potential then you should get someone in the 20-22 so you can develop them.
Otamendi is not world class but he is good.
Benedikt Höwedes is really good but older than Otamendi.
Neven Subotic the same, not world class.
Mats Hummels is really good.
Simon Kjaer is good as well, again not world class.
Alvaro Dominguez is younger, I don't know his stats for you, but he is your last option compared to the ones above.
Sebastian Toro not so good in my save, like Alvaro.
Kara is decent in my save, plays for everton, not world class.
Mamadou Sakho, here is potential, he can get really good with correct training facilities and coaches.
Jonathan Mensah, decent, plays for Wolves in my save.
Dedryck Boyata, maybe, with correct training, wildcard.
Nicola Nkoulou, plays for OM in my save, they come far in the CL, his heading in my save is dirt, but good player.
Ezequiel Munoz, I was interested in him, not anymore, he is as much decent to potential.
Mateo Musacchio, not world class, decent.
Kyriakos Papadopoulos, he is good, with correct training, possible world class.
Siyanda Xulu, I don't concider him world class, he is decent, plays for Aston Villa in my save.
Raphael Varane, he must be young on your save, 18-19 probably, has potential, hard to tell on world class, I have scouted him once, did not ring a bell for me.
This all depends on your save and who has had them, but out of all your suggestions there are 6-7 that can play as world class.