Michael Laudrup bemoaned Swansea City's inability to convert chances after Wednesday's 3-1 defeat at Birmingham City in the League Cup.
The Welsh outfit's defence of the competition ended in the third round, with goals from Dan Burn, Matt Green and Tom Adeyemi putting the Championship side 3-0 ahead at St Andrew's.
Wilfried Bony did manage to notch a consolation late on for Swansea, but the damage was already done by the time he found the net deep into injury time.
It could have been a different story for the Premier League side, as Bony and Alejandro Pozuelo both hit the crossbar in the first half.
The latter then had further two opportunities, but their profligacy in front of goal was punished by Lee Clark's side after the break.
"We could have been three or even four up at half-time, but we weren't and I said one day we will pay the price - I didn't know it would be today," Laudrup said.
"They score the first time they have a chance and they are 1-0 up and then we have to score an equaliser and going forward like that saw us make mistakes and have misunderstandings at the back.
"The second and third goals were the result of our misunderstandings.
"We could and should have done better. We should have won this game after the first half. It should have been finished there.
"In the end we lost it, so I don't know what word to use but we can be a little sad about that.
"We won this (League Cup) last year and when you are champions you want to go a little bit further than this. It's the first game and we are out in a game we could and should have won."
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