To make matters worse in the time added on for the stoppage Arsenal scored a goal through Freddie Ljungberg
Redknapp said: "I know managers say they did not see the challenge and genuinely I did not.
"But we are all going to see it on television sooner or later and there is no doubt he deserved it.
"There was no need for him to even make that tackle because it was deep in the Arsenal half and there was nothing on him.
"It was an obvious sending-off and I do not know what he was arguing about. Prutton knows what he did and the game is not about the sort of things he was doing.
"You would have thought having already been booked that he would be much more cautious but there was nothing could stop him.
"The tragedy is that he could have got a red card for his first tackle which was horrendous but for pushing the referee, he's in trouble."