Houllier said: "Listen, when you have to travel for a game away in Europe midweek then you have to travel again on the Sunday it is difficult and tiring.
"You just don't have the same spark and this isn't a bad result. I would say it is just a missed opportunity to extend the lead over Newcastle.
"We dominated the match and had the chances to win it. Leicester had a chance to win it at the end but that would have been very unfair as we did not deserve to lose."