Alphonse Areola replaced Thibaut Courtois after only 45 minutes of Real Madrid's Champions League game at home to Club Brugge.
Thibaut Courtois was substituted at half-time of Real Madrid's Champions League clash with Club Brugge, with the home side losing 2-0 at the Santiago Bernabeu.
It was not immediately clear whether his withdrawal was tactical or due to an injury, although there are reports he was feeling unwell.
The Belgium international conceded two goals to Emmanuel Bonaventure Dennis during a dismal first-half display from Zinedine Zidane's men.
The home fans made their feelings clear as the half-time whistle sounded, with Courtois among those targeted with jeers as he made his way down the tunnel.
Zidane took swift action to try to address the scoreline, with Courtois and Nacho Fernandez replaced by Alphonse Areola and Marcelo.
Courtois has missed only one Madrid match this season, sitting out the 2-0 LaLiga win over Osasuna on September 25.
It was Zidane's decision to make the former Chelsea man his number one that led to Areola's arrival on loan from Paris Saint-Germain, with Keylor Navas heading to the French capital on a permanent deal.