Graeme Souness agreed Lucas Neill deserved his red card during Blackburn's 3-1 home defeat by Liverpool.
The Rovers defender was sent-off for a high two-footed tackle on Jamie Carragher, one of several controversial incidents in an eventful game.
But the Blackburn boss was unhappy with the overall performance of referee Neale Barry - and spoke to him at the final whistle.
"The only thing I said to him was 'It was not one of your best days, was it?'," Souness said.
"Just in general he had a poor day - and I don't think I will get in
trouble for saying that.
"I have seen the sending-off on a video replay and it was not the best
challenge, it looked a sending-off.
"It changed the game dramatically. We were on the front foot and get a goal then within a very short time they equalise and we are down to 10 men.
"From then on it was backs to the wall and we were still in it until Harry
Kewell got their third goal in the last minute. They used their spare man very well, they deserved to win - it was their day."