Isaac Jefferies plays as a winger for Cardiff City's U18 side, having first joined the Club as an eight-year-old.

Following a long lay off through injury ahead of the 2021/22 campaign, Isaac made a terrific return in October, coming off the bench to net for the U18 side against Ipswich Town. Following his return to fitness, Jefferies has claimed a spot playing regularly for the young Bluebirds.