Sammy Lee hailed Robbie Keane's "immense" contribution for Liverpool after the striker's double against Bolton, which ensured the Reds will be Barclays Premier League leaders when they face Newcastle on Sunday.
The Irishman has finally produced the form to justify his £20million price tag after weeks of debate about his quality and even suitability to Liverpool's style.
Lee said: "We have had no doubts in Robbie's ability or his work-rate, and what he adds to this club is immense."
He added: "We know the quality of the boy, we know what he is capable of and what he is doing for us and what he adds to the club."
Lee explained: "We don't feel that Robbie has been out of form, despite what people keep saying. He has been working hard, tirelessly for the team, and that is the measure of the lad that he has kept on going.
"People have said things about him, but we know why we brought him to the club and we have had no problems at all with him, whatsoever. I do not feel he has ever lacked confidence here, he has kept going and done well."
Lee was standing in for manager Rafael Benitez, who was in the directors' box after recovering from a kidney stones operation.
Bolton boss Gary Megson admitted his own team were "cut apart like a knife through butter".
Megson said: "We set up to flood midfield with players, but changed that system when it clearly wasn't working.
"But we did not want to play 4-4-2 at Anfield, because Liverpool go through you like a knife through butter when you do that. And that is what happened a few times in the second half when we did try to push more men forward."
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