A brace from Dirk Kuyt secured a 2-0 win for Liverpool.
“We came here in good form but really I was disappointed with us tonight,” he told Sky Sports.
“We had a great opportunity and we didn’t take it. We had some players who were below par tonight.
“We got off to a bad start. They worked hard, pressed hard and played with great enthusiasm.
“You never get an easy game here. They responded to the crowd and they deserved their win.”
Redknapp believes his side missed Aaron Lennon, who missed the game with a groin problem.
He added: “We had a decent spell at the start of the second half when we started to hit Crouchy (Peter Crouch) because we couldn’t play through midfield.
“Liverpool had key players missing but we missed having an outlet like Aaron Lennon.
“We lacked that bit of spark and pace.”
