We need to see the extent of kompanys injury before we go BIG on a CB in January.
Denayer has a big future with us and that needs to be taken into account too. If it looks as though kompany will be missing the majority of the season and it looks as though it will be a constant worry, then yes it will need addressing, but that is something that will probably have to be rectified in the summer!
Denayer, otamendi, kompany and another top CB in the summer would be ideal, with Kompany being relied upon a lot less hopefully!
In January I would like for a short term solution. Somebody who is just a safe pair of no nonsense hands! Easier said than done though as I can't really think of anyone off hand