Unai Simon, 22, is reportedly attracting interest from Real Madrid amid criticism of goalkeeper Thibaut Courtois.
Eden Hazard was wasteful against Galatasaray on Tuesday, but Real Madrid coach Zinedine Zidane says he is not worried.
Marcelo lamented Real Madrid's first league defeat of the season as Thibaut Courtois questioned Alvaro Odriozola's decision-making.
There were reports Eden Hazard was out of shape when he joined Real Madrid, but Roberto Martinez does not think that matters.
Real Madrid have denied Thibaut Courtois has been affected by anxiety, yet he will not play against Granada this weekend.
With Marcelo, Nacho and Ferland Mendy sidelined by injuries, Real Madrid have no established left-backs for their clash with Granada.
Thibaut Courtois came off at half-time against Club Brugge, with Real Madrid issuing a rebuttal to reports about the goalkeeper's health.
Linked with Christian Eriksen and Donny van de Beek, Real Madrid are planning to strengthen in January.
Thibaut Courtois was taken off at half-time in Real Madrid's 2-2 draw with Club Brugge, but Erwin Lemmens has backed him to bounce back.
Real Madrid scored two second-half goals to draw 2-2 with Club Brugge, but coach Zinedine Zidane was far from pleased with the performance.