Antonio Blanco featured for Real, having played for Castilla the previous day.
Zidane said, “They've got bright futures ahead of them. They've very good players and are so disciplined.
"Chust put in a really good performance and showed his character. Blanco made his debut and we already know all about Arribas. The youth-team players are always in the mix.
"Mendy and Valverde were withdrawn at the last minute and we had to organise things as we went along. That's why they played for Castilla. Despite having played yesterday, Blanco did excellently when he came on."