Keane has only scored in one Premier League game this season
Rafael Benitez admitted he has yet to see the best of Robbie Keane after the striker was taken off for the 15th time this season in the draw with West Ham.
Keane arrived at Anfield for a �20.3m fee from Tottenham in July but has only scored four times and completed the full 90 minutes on three occasions.
Benitez said: "Robbie is a better player than the one we are seeing now.
"He gets disappointed when things are not going his way. He is a worker but can improve. He will be OK."
The Irishman was replaced after 66 minutes by 19-year-old French striker David Ngog on Monday as Liverpool chased the win that would have moved them three points clear in the Premier League.
Benitez added: "Robbie was disappointed when he came off. But players always want to be on the pitch for 90 minutes.
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