According to The Athletic, Xabi Alonso told Endrick it will be difficult to get regular playing time.
The Athletic:
🚨 𝗡𝗘𝗪: Xabi Alonso told Endrick it will be difficult to get regular playing time but he stayed because his priority is to succeed at Real Madrid.
The issue will be reviewed in January, if he has to leave or stay. Endrick has not played in 5 months.