"I made a judgement that our young reserves would have enough to win, but it never looked likely," Lawrence told the BBC..
"No disrespect to Bangor, but if we can't beat them what on earth are these lads doing playing for Cardiff?
"They failed miserably in a pressure game. Half of them won't be here next season, that's an absolute certainty."
Lennie saw his young charges bow out of the competition after a Byron Anthony own goal after just 4 mins. For Bangor it's a guaranteed £25,000 even if they lose the semi final. City pick up just £15,000 for losing at this stage of the competition.
"Bangor were well organised, well disciplined and deserved to win. I hope they get to the final and get some money out of it, they've earnt it."