Town centre-half Christophe Berra believes Nottingham Forest striker Simon Cox should have been shown a second yellow card for what he felt was a dive during the first half of Saturday’s 0-0 draw at the City Ground.
Cox took the ball past the advancing Dean Gerken and went to ground with replays showing there was little if any contact with the Blues keeper.
Referee Scott Mathieson waved the Forest protests away but took no further action against the Irish international, who had already been booked for a foul on Frank Nouble.
"I think it was a dive. I think he should have been sent off,” Berra said afterwards. "If the ref doesn't give a penalty, it has to be a yellow card.
It was a dive, I was looking straight at it, but they never got punished for it. That's football for you - the referee has the hardest job on the pitch."
The Scotland international was pleased with the draw: "I think in the long term it was a good point for us.
"They are a tough team and they have a big budget. They've spent a lot of money, so this is going to be a tough place to come for anyone.
"Our keeper made some excellent saves but then again their keeper did as well. We started off well but they came back and put us under pressure.
"The last 10 minutes we were on top, we were pushing for it. We're on a good run and we need to keep plugging away."