Steve Bruce's side have proved difficult to beat in recent weeks, claiming points from both Manchester City and Aston Villa, and their leading goalscorer Darren Bent has scored five goals in his last four games for the club.
"Bent is a good player," Benitez told the official site. "He's always thinking about scoring and it could be a problem for us. Twenty goals in the Premier League is a fantastic achievement.
"They have some other good players and they showed good team spirit in the game in October. I think they're improving a little bit now so it will be dangerous.
"They will be working hard, they'll try to be organised and push and press and play counter-attack.
"But playing at Anfield makes a big difference for us and we'll have to play well in front of our fans."