Houllier said: "Leicester are in good form and it will be an aerial battle but we will be ready for that.
"We played Wolves who are battling for survival and as we saw from that game it isn't always easy to play teams like that. We are fighting for another cause which is fourth place and I think it will be an exciting game.
"The mental strength of the team will be a vital element to keep the fourth place right to the end. We have got the squad. We want to be in the Champions League next season and we have nine cup finals remaining."