Listening to Les on Radio Merseyside, it sounds like Raven will be coming, Teriyaki is still talking with the club, but we're close to spending our budget so doesn't sound like we'll be signing beyond those two(or another forward if the Turk doesn't come). Personally think if things are that tight, we shouldn't bother signing Raven, as right-back is not a priority. Kay and Holmes play there, while McChrystal and Weir can fill in if there's an emergency.
I'm not too worried about central defenders, with the proviso that we're going to have to accept that Goodi can't go on for ever. Ash usually turns in a decent stint in that position, though my qualm is a Taylor-McChrystal pairing will be prone to giving the ball away too readily. Holmes can play in central defence, I believe Zoum was tried there during pre-season and Vaulks one of our more promising youngsters also features there.