Paul Jewell believes his Bradford City side "shot themselves in the foot" in their disappointing Worthington Cup exit against First Division Barnsley.
City scored two goals at home for the first time this season through Lee Mills and David Wetherall but it was not enough to prevent them slipping to a 3-2 defeat against their Yorkshire rivals.
Jewell blamed poor defending for City's defeat and says they must cut out sloppy mistakes when they resume their Premiership campaign at Wimbledon this weekend.
The City boss said: "We gave away two ridiculous goals after taking the lead. If you concede from corners like we did then you give yourself little chance.
"We have to cut those mistakes out. The back four has been solid for most of the season but we gave away goals with individual errors.
"I've been saying for a long time that should we go a goal in front then things might change for us. We finally managed to do that, but then we go and let it slip by conceding two minutes later.
"And then, from the worst corner of the night, we go and let in a second.
"It was definitely a penalty as well. We shot ourselves in the foot."
But Jewell has urged his side not to be too downhearted with an important Premiership clash just days away and says they must look to take some positives out of last night's game.
He said: "I thought Lee Sharpe did well and I was made up for Lee Mills to get off the mark.
" We looked like scoring goals - which is what I want to take out of this game.
"We made their keeper make some saves.
"The only good thing to come out of the game though is that we haven't lost any league points."
Barnsley boss Dave Bassett believes his side deserved their victory after taking a 3-1 lead before Wetherall scored with just three minutes remaining.
He said: "It would have been unfair if they had scored an equaliser.
"I thought Gary Walsh had more saves to make than Kevin Miller but you are always anxious in moments like those.
"A fourth goal would have made things a lot easier for us and killed the game off.
"But at 3-1 down Bradford knew they had to go for it and they weren't too far away from an eventual equaliser.
"It is all confidence. I thought they were up for it and scored a goal but then when they went behind you could see they were a side lacking confidence in their play."
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