Real Madrid have dismissed claims that Thibaut Courtois suffered an anxiety attack in the midweek draw against Club Brugge, but manager Zinedine Zidane admits the former Chelsea goalkeeper is not "undroppable" after a poor run of form.

Courtois was substituted at half-time of Tuesday's 2-2 Champions League draw at the Bernabeu after conceding twice.

It has since been reported that Courtois had anxiety-related problems, but the club said on Friday that the Belgium international was replaced because of acute gastroenteritis.

Real are top after seven games, one point ahead of Granada and Atletico Madrid, but have struggled in Europe and are without a win in the Champions League.

"We are not as bad as people outside are saying but this is Real Madrid," Zidane said.

"It won't change what people say. We are focused on what we can do on the field.

"We have a game now to stay first at the end of the game."

Promoted Granada have been the surprise package in Spain this season with 14 points from their opening seven games.

Granada's win include a 3-0 victory at Espanyol and a 2-0 home success over Barcelona.

Former Tottenham and Valencia striker Roberto Soldado, who began his career at Real Madrid, could miss out with a thigh problem.

Adrian Ramos or Carlos Fernandez stand by to deputise for Soldado, while midfielder Eteki has been ruled out with an ankle problem.

"Real Madrid is the winner of several Champions Leagues in recent years, it is a top team," Granada manager Diego Martinez said at his pre-match press conference.

"It has taken us a lot to get here and we are a good team.

"But we belong to different universes and in 90 minutes we will try to minimise that.

"We want to be competitive and to show the best of ourselves. That is the path we are going to follow to try to win at the Bernabeu."