Houllier said: "Emile is one of the most powerful players in the entire country and when it all comes together there is no stopping him," Houllier said before Liverpool's League Cup semi-final with Sheffield United.
"Sometimes you have to push him a bit. Maybe he is just too nice a guy. I said to him recently that he was a sleeping giant and he did not argue,"
"He knows that is the case. It is worth remembering that he does contribute, even when he is not scoring. He makes goals with challenges and opens up situations for team-mates.
"He is also still young but he does need to promote himself a bit more."
"He has been hampered by injury and the aftermath of the World Cup," "He is one of those very unselfish players who likes to play for the team, and that is no bad thing. But he could do with pushing himself forward a bit."
