Darwin Nunez is the most expensive player in Liverpool history.
The 22-year-old forward signed a four-year contract with the Reds and had two disappointing performances in the pre-season.
But club legend Luis Garcia has urged the Uruguayan forward to work harder and improve his work rate.
Garcia to ESPN FC:”No, not at all. What I have realised is that he is going to have to work harder.”
“Liverpool play in a different way to Benfica. He is a player who is very clever; his football intelligence is fantastic. But he has to track back, he has to press. In the two games against Manchester United and Crystal Palace he has struggled.
“He wants to show that he is going to be ready to play, with the press, with that high pressure that [Jurgen] Klopp does with Liverpool. But after three or four runs he was tired. He had a few chances, but I think it was because he was tired.
“He only had three [training] sessions, then into the game with Manchester United. He had 10 sessions then faced Crystal Palace, but only played 30 minutes. I think his movements, the way that he plays, will give [Liverpool] a lot. But they need to wait. He needs to be physically ready.”