As Paco González (a man who is considered by many to be a reputable source with direct information from Florentino Pérez) stated in Cadena Cope's show El Partido de las Doce, Sami Khedira wants to extend his contract with Real Madrid and his agent has already got in contact with the organisation in order to start negotiating.
Furthermore, still according to González, Los Blancos will make no signings in the winter transfer period unless any other Real Madrid player gets injured. Although Real Madrid were supposed to already have an agreement with Cruzeiro to buy Lucas Silva, the Brazilian club is said to have asked for more money afterwards and Pérez would have refused. Cristoph Kramer, who would have been contacted later by Real Madrid, is, in principle, interested in staying in Germany.
Finally, no further news about Marco Reus. There was a rumour about José Ángel Sánchez travelling to Germany to sign the player before the Christmas break but, according to González, it is not accurate.