Come on. Lets stop worrying about that. We need four top class defenders and we got that in carra,dagger,skrtel,cahill(if he joins.). Look at chelsh!t they got terry,alex,luiz and ivanovic and yet every one is happy and even look at manc's they got vidic,ferdi,jones,smalling,evans. So i think signing cahill wouldnt really create any discontent among players but it creates the most important thing that is the competition.
