Carlo Ancelotti has offered no clues as to who may start against Osasuna and has called up all 23 first-team players, plus 21-year-old Luis Lopez.
Even Ferland Mendy, whose fitness has been a question mark for some time, has been included.
The Frenchman has only played 29 minutes - 19 in March's Clasico in La Liga - in the last three months, and has been out since the beginning of April.
Also present is Luka Modric, who will likely face a late fitness test, despite progressing well from his physical problems.
It could be one of the Croat's last chances to win a trophy in Los Blancos' shirt, if the rumoured signing of Jude Bellingham for next season is confirmed.
Real Madrid's squad
Goalkeepers: Courtois, Lunin and Luis López.
Defenders: Carvajal, Militão, Alaba, Vallejo, Nacho, Odriozola, Lucas V., Rüdiger and F. Mendy.
Midfielders: Kroos, Modrić, Camavinga, Valverde, Tchouameni and D. Ceballos.
Forwards: Hazard, Benzema, Asensio, Vini Jr, Rodrygo and Mariano.