The 21-year old Brazilian playmaker has netted just five times in 29 Premier League appearances since his £8.5million move from Inter Milan 12 months ago.
"Sometimes my positioning is not the best and I need to improve that to score more goals," he told LFC TV.
"I want to continue improving and look forward to working harder - and harder on what I need to do to be considered a great player.
"It's a year that has gone very quickly and I am living in a very happy moment.
"I think I have improved with my positioning on the pitch because sometimes I play on the wings and other times in the middle.
"I have improved my knowledge a lot more and have worked harder on my finishing."
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