Spurs were one goal down when Robbie Keane appealed for a penalty early in the second half after a challenge by Chelsea defender Ricardo Carvalho.
“He (Carvalho) has caught him (Keane) and what Robbie’s done is try to stay on his feet, and that is what happens,” Redknapp told Sky Sports.
“If he had gone done when he had lost his balance it is a nailed-on penalty but he tried to stay up and it is a difficult one.
“If he felt he had dived then why didn’t he give him a card, it is either a penalty or a card.
“We had him (Webb) at Old Trafford last season and he cost us the game with a diabolical penalty decision that he apologised for after.”
Redknapp added: “Losing Ledley was a key moment for us. We are short at the back without him and suddenly (Didier) Drogba was a big problem for us with his power.
“For the first 30 minutes we were the better team but I thought the key points went against us and we didn’t defend well enough for the second goal.
“But we are not that far away from being a very good side and I think we will get there eventually.”
