Ancelotti could choose to give club captain Iker Casillas a domestic recall following his fine performance in Tuesday's 2-2 draw with Juventus, although Diego Lopez is likely to retain his place as number one this weekend.
Cristiano Ronaldo missed training yesterday after scoring in Turin, but is expected to recover in time for this weekend's clash in the Spanish capital.
Sociedad travel to Madrid on the back of a four-match unbeaten run in La Liga, which was followed by holding Manchester United to a goalless draw in Champions League action in midweek.
Possible starting lineups
Madrid: Lopez, Marcelo, Pepe, Varane, Ramos, Illarramendi, Khedira, Isco, Ronaldo, Bale, Benzema
Sociedad: Bravo, De la Bella, I.Martinez, Gonzalez, C.Martinez, Prieto, Pardo, Zurutuza, Griezmann, Vela, Agirretxe
Sports Mole says: 3-1