Carlo Ancelotti is preparing Los Blancos for four games in the space of 12 days, which starts and ends with the two domestic cup matches against the third tier team.
Therefore, the Italian is expected to rest many of his first-team regulars, which gives some of the fringe players a chance to play.
Real have won their last five games and trail Barcelona and Atletico Madrid by just three points after 15 games. They face Copenhagen in their final Champions League match on Tuesday before returning to league action against Osasuna.
Possible starting lineups
Olimpic: Francis, Pepin, Belda, Revert, Peris, Alcazar, Vaquero, Marenya, Martinez, Rifaterra, Najera, Mosquera
Real: Lopez, Coentrao, Arbeloa, Nacho Fernandez, Varane, Casemiro, Illarramendi, Modric, Jese, Bale, Morata
Sports Mole says: 0-6