We've got Scales and McKenzie for left centre back and Stewart and McRorie on the right. That's enough for one game surely? Goodwin's right though, it would be a massive distraction. Replacing your captain a couple of days before the game would be fairly massive. The alternative being that we sign a centre half that isn't good enough to displace Stewart, which would also be ludicrous.
That said, the issue doesn't go away beyond Sunday.