"When I decided to sign Pellegrino as a player it was because he is very clever and tactically he could help the other defenders," explained Benitez to liverpoolfc.tv.
"He wasn't at his best because he was at the end of his career but he is showing now as a coach how brilliant he is tactically.
"I think everyone has been impressed by the things he has done since he arrived. He is a winner, he is very clever and he has a real passion for football.
"The only concern for me is maybe he will leave in the future because he can be a fantastic manager."