Sandro carelessly lost possession to Fabrice Muamba, who played the ball on to Matt Taylor. He found Kevin Davies and his finish was clinical.
Redknapp believes Sandro learned a harsh lesson and said: "The ball came into him and he thought he had all the time in the world.
"In Brazil they drop off you, you look up and play, but the ball wasn't there any more. Muamba had sacked him. The ball is shifted to Davies and we are 1-0 down. But Sandro will be a good player."