Benitez has more injury problems involving Yossi Benayoun, Daniel Agger and Albert Riera, while Torres could be out for a further three weeks, which would rule him out against Manchester City and Everton in the league and the Champions League tie away to Debrecen.
He said: "We are talking of two or three weeks out now for Fernando. The hamstrings for Riera and Benayoun could be the same and Agger has more problems with his back.
"He has worked hard in training, and we felt he would be okay for the match. But you could see that he was not right.
"Steven Gerrard looked okay after his groin problems, physically he was fine. We will have to see how the injury reacts but he brought us quality and passion, and I hope that we can now manage his problems better."