Afraid I can't see anything other than a budget replacement, which is why sadly, an unfit Campbell makes so much sense to me.
Don't seem to feel quite as bitter about his departure as others but I'm not excited at the prospect of someone who is struggling to get into the Newcastle team whether by poor performances or fitness issues. But if it's not Sol, I'd put imaginary money on being someone we haven't been linked to and someone who probably isn't really good enough for our club, certainly not long-term.
Either that or we'll be selling Squillaci/Koscielny some time soon but Wenger is normally one to give players a good chance before he bins them.