Will Vaulks was named captain for Cardiff City’s under-23 team against Birmingham City at Cardiff Sports Campus and Gary Madine led the attack.
But coach Andy Legg’s Bluebirds slipped up against the Blues with midfield playmaker John Concannon firing the Birmingham winner.
Worcestershire-born Concannon, aged 19, struck just before half-time and that proved to be the only goal of the match.
Madine went close with a shot from 15 yards, but goalkeeper Moha Ramos touched the ball wide. Centre-forward Madine had another first half effort saved by Ramos, a teenage goalkeeper signed on a season-long loan from Real Madrid.
Ramos, a 19-year-old born on Tenerife, was in outstanding form for Birmingham, while Bluebirds ‘keeper Matt Hall made a series of quality saves,
Ciaron Brown defended well at the heart of the back four, while Jake Evans played a major role in midfield.
Former Auxerre midfield player Tavio d’Almeida suffered when he collided with Ramos. Both teenagers had treatment and were able to play on.
Cardiff City: Matt Hall, Cameron Coxe, Joel Bagan, Tavio d’Almeida (Tom Sang 60), Ciaron Brown, Ben Margetson (Ryan Pryce 66), Jake Evans, Will Vaulks (capt), Gary Madine, Laurence Wootton, Shamar Moore (Sam Bowen 60). Subs: Trystan Jones, Jamie Cogman (gk), Sam Bowen.