Definitely, I'd make a top priority for us to sign some defensive cover in January. Ridgewell sounds like he fits the profile and considering we have been linked with him in the summer and a couple of weeks ago, can honestly see us going for him again.
A few people have mentioned Pieters but don't think we'll sign him really. He would be an ideal signing considering he can play CB and LB but as it stands, don't think he'll even be first choice in the team so signing him would be somewhat pointless atm (unless Simpson and Raylor have a massive drop of form).
Aye, getting Maiga is great as he sounds like he'll be a really good addition and bulk us out a bit up top but that's not really the priority as it stands. We have no cover at all at CB at the minute. Williamson is out and if anything happens to Coloccini it doesn't bear thinking about. The thought of going into a run of fixtures with Perch is frightening.