The trio all withdrew from their international commitments this week as they all had or were recovering from injuries. All three will be fit to face Manchester City this Saturday however.
"Agger is okay. He had a small problem with his back but he's training. It was a very good decision from Denmark's manager [to withdraw Agger] because he is much better now. I think he'll be okay for the weekend," said Rafael Benitez.
"Johnson has been training. Not full sessions, but training, so hopefully he'll be okay for the weekend too.
"Gerrard is doing well. He finished a full training session today, so if he can carry on then he'll be okay as well.
"Fernando Torres is training with the physios, so I don't think he'll be available."