O'Neil also mentioned an incident from last season against West Ham when his side had a goal disallowed for Tawanda Chirewa blocking Lukasz Fabianski's view during a shot. However, the 41-year-old revealed he did not want to make excuses for the same.
"It was similar to a goal [Wolves had disallowed] against West Ham last season," he added. "We sent an image to referees showing with proof that the West Ham keeper could see the ball, but the reason were given was the player was in close proximity. The same argument could be said here but we just have to accept it.
"I would rather not discuss it because it will still sound like I am making excuses. Whatever decision they make, I respect. We don't want to cross that line, but it did feel like a harsh one. I am proud of the players though. An unbelievable effort and we gave ourselves a great chance. I am gutted for the players that we had to leave with nothing."