Houllier said: "We were in control in what was not an easy game on the back of a European performance. You are always going to be affected by a tough European game in midweek, but the linesman changed the game.
"The players here at Southampton wanted to impress their new manager but I didn't think they needed the linesman's help to that extent.
"We had the better chances in the first half and Jerzy Dudek didn't have a lot to do. Their keeper got the man of the match award and that says everything.
"We're not very happy with the result but still have 11 matches to play and know it is still in our hands