United manager Simon Grayson blamed naivety for costing his side at Derby County on Tuesday.

A stunning effort from Max Gradel gave United a deserved lead early in the second half, but the hosts hit back to score twice within a matter of minutes to turn the game on its head, and there was no way back for Leeds.

"It was hugely disappointing," said Grayson. "It was a game there for us to win because they are down on confidence and hadn't been winning - and we should have done because it was there for the taking if we'd have taken it by the scruff of the neck.

"We were in control in the first half without being overly impressive. Defensively we were sound, we limited them, and at half-time we said let's go for them by the throat. We got the goal and then we were just too naïve.

"We were passing it pretty instead of showing the nous to kill them off by getting them turned straight from the kick-off. We gave it away four or five times in the midfield area. That's know-how and seeing stages through. The crowd would have turned on them and got frustrated, but we gave them encouragement.

"The goal lifted them, we switched off for the second one and it's driving me mad. It epitomised both our games against Derby. We were trying to play through teams, you have to mix it up, go long, squeeze them. It's about being ruthless. If we'd done that we would have scored a couple more."