Redknapp is no favourite with Villa fans. One threw a coin at him when he was there as Portsmouth boss 13 months ago. It missed, but hit linesman Phil Sharp.
Redknapp said: "Hopefully the idiot who threw the coin is not there any more. If he is, I'll wear a crash helmet!
"But I am not worried. It's all forgotten about. You always get a few idiots in every ground."