Former Brazil boss Wanderley Luxemburgo has replaced Mariano Garcia Remon as coach of Real Madrid.
Real confirmed the move at a news conference on Thursday, which followed a board meeting.
Luxemburgo, 52, quit as boss of Brazilian champions Santos to become Real's third coach this season.
"It is a very great personal satisfaction to coach the world's best team," said Luxemburgo, who has agreed a one-and-a-half-year contract.
"What I will bring to Real Madrid is discipline, unity, hard work and professionalism.
"I have come here to win. I cannot say any different but I cannot promise
"What I can do is to work very hard in the Primera Liga and the Champions League in order to bring them to Real Madrid.
"The players have to make sacrifices and our priority right now is to form a unity between the players and the club."
Real's Brazilian full-back Roberto Carlos gave his backing to the new appointment.
"Luxemburgo is the best coach for Real Madrid," said Carlos. "You will see that in training and in matches.
"Wanderley is going to bring true football to Real Madrid."
Jose Antonio Camacho was in charge at the start of the season, but left three weeks in amid reports that he had found the team's superstars too hard to handle.
Remon, who will remain with the club in a reduced capacity, succeeded Camacho but, like his predecessor, struggled to motivate Madrid's star players.
Since Remon took over, the Spanish giants have continued to struggle in La Liga and are in fifth place, 13 points adrift of leaders Barcelona.
Real also struggled to qualify for the second round of the Champions League.
Luxemburgo coached the Brazil national team between 1998 and 2000, leading them to success at the 1999 Copa America.
He also guided Santos to the recently completed Brazilian championship.