NIGEL Clough criticised the performance of referee Darren Drysdale after Derby were narrowly beaten 2-1 by Millwall at The Den.
Clough was left bemused at the officials' decision to allow Liam Feeney's opening goal to stand after it had initially been ruled out for offside.
The Rams boss also felt his side should have had two penalties but criticised Craig Bryson after his error led to Andy Keogh's winning strike.
"I've had no explanation, none at all," said Clough, referring to Feeney's goal. "The players are not privy to the conversation between the linesman and the referee.
"I saw the assistant give offside and keep his flag up, but the referee has gone over and changed the decision. Why he did that, I don't know.
"The lad who scored didn't look offside so we presume it's for Keogh in the middle. Once he makes an active attempt to get the ball, it affects our defenders.
"He went for the ball. [I don't know] whether he touched it or not, but he must have been very close.
"We should have had two penalties – one at the end and one in the first-half. It happens sometimes and we can't control that.
"We can control our own performance which was a little disappointing in the first-half, but we were still entitled to go in on level terms because of the disputed goal or the penalty.
"I thought we were excellent in the second-half but a mistake has given them the second goal. Craig should be kicking the ball into another part of London, not shielding the ball out. I don't know why players do it."