Marvin Park and Sergio Arribas both featured for the first match of the season.
Marvin came on after 70th minutes against La Real in place of Rodrygo, while Vinicius Jr. was replaced by Arribas in injury time.
The two youth-team graduates, who will play for Real Madrid Castilla this season, were part of the team that won the UEFA Youth League on August 25th.
Marvin joined the club in 2016 and has gone through all three juvenile teams before making his way to the reserves. Arribas joined the Real Madrid youth academy in 2012 and has progress through the age groups from the under-12s all the way to the under-19s.