"When you bring somebody in during January you hope they can make an impact," said the Liverpool boss.
"You are also looking at it as a six-month adaptation period before you get the best out of them from pre-season onwards.
"We are all pleasantly pleased and surprised by how well he has done. His numbers tell you the story in terms of goals and assists.
"At the minute, you can't ask any more. The key thing is that he works his socks off as well. He is a real team player."
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