Overview
- Arsenal U21s led through Marcell Washington on 17 minutes before Troy Perrett equalised two minutes later.
- Alexei Rojas was sent off just before the hour for a foul after an under-hit backpass, swinging control to Cardiff.
- Will Spiers put Cardiff ahead in the 67th minute and Trey George added a stoppage-time third.
- Manager Brian Barry-Murphy handed debuts to five academy players: Gabriel Keita, Alyas Debono, Matty Apter, Trey George and Dan Ola.
- Cardiff advanced as group winners and Arsenal U21s were eliminated, with the last-32 draw scheduled for 13 November at 14:30 GMT.