Villa number two McAllister believes Houllier has to be allowed to bring his own signings in before any long-term judgements are made.
But the former Scotland star feels there is enough quality in the current squad for there not to need a radical overhaul.
McAllister said: "Give it time. The manager needs time to establish his style, his own methods, to get them ingrained in the club.
"He needs to bring his own people in but, I've got to say, there is not a great deal that needs to be added to this club. It is a few little tickles here and there. There are a lot of quality players here.
"We just feel in certain positions we might need a bit more experience and in other positions we might need a bit more quality. But it doesn't need a great deal. It just needs a little bit of tinkering."
Source: PA
Source: PA