Benitez says he cannot wait to have the former England skipper back in his starting XI to boost the team's winning attitude.
"He is also a great player and a great leader. Maybe in some games we lacked something like this but John can now be a key player for us for the rest of the season.
"He is good with both feet, good at playing the ball and has good vision too. He is a player who can do things for you in the way you analyse football.
"New players have to adapt but he is doing well on the pitch. He did well against Stoke and knows what it is all about.
"We will have to see him on the pitch and analyse him."