Benitez was impressed with Pacheco's 15 minute cameo against Fulham on Sunday and believes the 19 year old forward could useful in unlocking stubborn defences in the future.
"He was trying. It was difficult without space but he was doing well. He is the kind of player who can make a difference in that situation," said the boss.
"He is a player with talent and if he can keep working hard, he will use it more effectively.
"Sometimes players with talent are a little bit inconsistent, so if he works hard, like he is doing now, he can be very, very important."