Derby assistant head coach Richie Barker admitted he still had frustrations despite his side’s 4-0 demolition of Northampton.

Barker thought the margin of victory should have been even bigger after Derby bounced back in style from defeat to Stevenage to blow Northampton away.

He said: “I’m pleased with the result but more so with the performance, the goals were excellent.

“My biggest frustration, if I’m being honest, is that it wasn’t more. It was a good opportunity for us to send out a real message but it’s about reaction and the ability to put things behind them 48 hours later and get on with it.

“Our reaction to losing the ball was excellent, we have to do the right things. People come here to watch goals, but you have to get the ball back to do that.

“Northampton ended up playing three different formations in the first half, which shows we created issues for them.

“People have gone away from here tonight saying we have the right work ethic. I was proud of them as a group of players. At the weekend we didn’t compete physically but here we gained in confidence.”

Max Bird scored his first goal of the season in the 14th minute, steering in a cross from Conor Washington who then burst between two defenders to add a second in the 22nd minute.

Bird bagged his second 10 minutes later when he converted Conor Hourihane’s clever pass and although Northampton made three changes at the break, they were opened up again in the 49th minute with Nathaniel Mendez-Laing dispatching Tom Barkhuizen’s cross.

Barkhuizen and James Collins missed good chances to add to Northampton’s misery but the result was still Derby’s biggest win of the season.

Northampton manager Jon Brady said: “They are an incredible team, they moved the ball brilliantly well with great rotations.

“We talked defensively about the way we had to move with the speed of the ball but when you have players who aren’t moving at the speed of the ball and leaving big gaps, it was plain to see in the first 15 minutes we weren’t at the races really.

“They were probably on a night at their best and we need to have every single player at 12 out of 10 to even have a chance of competing and our levels weren’t anywhere near that.

“We had little spells but we couldn’t get anywhere near their goal. Not being disrespectful to our players but they are a high-class team in the way they played and unfortunately we were below our standards to even try and get anything out of the game.”