'I can hardly believe what is happening. If we go on now and make the most of the next few days, it can end up being an unbelievable season.'
McAllister's midfield craft was sorely missed for most of Saturday's 2-1 win and he is likely to take over from Murphy, while Patrik Berger is also set for promotion from the bench after making an immediate impact as a late replacement for Vladimir Smicer.
Houllier is expected to stick with a strike partnership of Michael Owen and Emile Heskey. Liverpool face a reunion tomorrow with French referee Gilles Veissiere, who sent off Steve McManaman and Paul Ince near the end of a UEFA Cup-tie in Valencia two years ago.
Houllier said: 'He's an experienced official who is hard but fair. I do know that he is regarded as one of the best officials in France.'