Marcelo Bielsa was forced to name 15-year-old Archie Gray on Leeds' bench to face Arsenal with 11 of his senior stars out injured.
The Whites have been rocked by an injury crisis in the midst of their packed December schedule, with nine first-team regulars currently unavailable.
Bielsa has also hinted that Diego Llorente is battling Covid after confirming the defender will be out of action for the next 10 days.
And as a result of his depleted squad, the Leeds boss was left with no choice but to name Gray amongst the substitutes for their Premier League showdown with Arsenal.