"I don't want to blame the first-half performance on that," said Coleman to the media after the game.
"Ben was going to be important because Rob Hulse is a big boy and tough to handle and we were looking at Ben to do a job on him. "But he had been up all night with a migraine and we lost him in the warm-up.
"To be fair to Marcus Hall that's not his fault either. He has played all over the back four this season and he has come in again at the last minute.
"Our start had nothing to do with that, we just couldn't cope with Derby's tempo. They were quicker to every ball and they won every challenge in our box - that can't be right."