I think with us losing Terry it's obvious we need a centre back and more experienced goalkeeper. I don't believe Chester is a great communicator and the defence will miss that this season, also Elphick and Chester isn't the most commanding centre back pairing, they seem quite passive.
I wonder if we could get John Ruddy on loan from Wolves, or if Hart is still at city on deadline day then I would think he'd be the type of player that Bruce could get back confident...but we'd need that to happen very quickly indeed. Also Diego Cavalieri, Oscar Ustari, and Boaz Myhill are available on free transfers, and would probably be an improvement on Steer and Bunn.
For centre Back could we get a deal for Huth, he is a very typical Bruce signing, and might be ok alongside Chester with Elphick in reserve.
Everything depends on how much money there is available, and how much we're allowed to spend, but for me these are the positions where strengthening is most urgently required.
If money isn't such a problem, Max Meyer is available on a free, and must be worth a punt. I doubt he'd drop to the championship, but we can dream.