NIGEL Clough was left bitterly disappointed by the Brewers FA Cup exit after his team went down 2-4 to Northampton.
Three goals in the first half rocked the Brewers and they never recovered despite putting the visitors under pressure at the start of the second period.
Clough said: "It's pure disappointment being knocked out of the FA Cup and conceding four goals - that's 11 in the last four games and we haven't kept a clean sheet for a long time.
"To go 3-0 down inside 45 minutes was extremely poor from our point of view. They scored from two set plays and a cross and we are doing nowhere near enough to keep the ball out of our net.
"The whole team has to do more to protect the goal and keep the ball out. Although we are still attacking well and creating chances you are asking an awful lot to score four goals at home just to get a replay.
"We are getting punished. Every time the ball goes into our penalty area it seems to go in the back of the net. But it's little things that are costing us goals when people aren't quite doing their job well enough.
"We had our situations again throughout the game and I felt in that period just after half-time if we had got one back we could have had a comeback on our hands but, for 20 minutes, we couldn't put the ball in the net.
"It's not just losing the game today and getting knocked out. It's a big financial blow to the club. That limits us straight away with what we can do in the transfer widow."
The Brewers also had the setback of losing Richard Nartey to a first half injury.
Clough said: "He had a tight hamstring and we didn't want to make it any worse which is why he came off. It's not gone and it will be fatigue from all the games but he may be available for the next two and then we have a ten-day break."