I thought we were only going to loan him for now and then use our rights to buy him if we are pleased with his performances...
5mil is a fair amount, since he is younger and probably already even better than Zebina and surely less injury prone...
If we end up selling Zebina to cover the largest part of this transfer, it would be a wise choice.
Besides, we have Grygera and Mellberg and we can afford to gamble a bit there.
As for the CBs, we have actually 3 decent5 solutions;
Chiellini, Legro and Mellberg, if we sell Zebina then Ivanovic or Mellberg could be occasionaly be used as a RB.
Knezevic will return soon from his injury, but Andrade wont, Legro seems to be a bit less sharp this year and he will be just a sub.
They way we are now, i see Ivanovic as a safe bet, we are covered in every position, even if he doesnt play a single game and even if we sell Zebina to get him.
But if Ivanovic is proved good enough, as a CB, or even as a RB, there is plenty of room for him to shine and he would only do that being better than our current material and raising the standards in our team.
Knezevic would indeed become useless under those circumstances, but if we fail to grab Ivanovic, we know that we have the 4th CB sub already covered...
I would prefer a player like Chiellini instead, someone who could play as CB and LB, but since we are interested to cash in on Zebina, then i guess we are fine...