Carlo Ancelotti sees no issue with the jeers directed his side's way by some sections of Real Madrid's support.

Madrid were forced to go to extra time in Thursday's Copa del Rey clash at the Santiago Bernabeu, as Celta recovered from 2-0 down.

However, Los Blancos regained their composure to win 5-2 and progress to the quarter-finals, with teenager Endrick scoring twice.

The match was Madrid's first since they were hammered 5-2 by 10-man Barcelona in the Supercopa de Espana last week, and Ancelotti suggested the fans' frustration must act as a "wake-up call" for his team.

He told reporters: "I see it as a wake-up call from the fans to the team and its coach.

"It's an acceptable wake-up call after what happened in the game against Barcelona. Afterwards, the team reacted well.

"The fans booed to give us a wake-up call and then later because the team started to complicate a game that we were well on the way to winning with 2-0.

"But then the fans started to push and when the Santiago Bernabeu pushes it's something very special for us.

"Good thing we played well in extra time and managed to win the match, so it was all good in the end."

Ancelotti lamented his side's missed opportunities to extend their lead in the second half and urged his players to maintain focus in the final minutes of matches.

"The tension drops at the end. We made two mistakes and let our opponents back into the game, we left it open in a game that was practically over with two goals in front," Ancelotti said.

"We gifted our rivals two late goals when the game was almost over. First, we made a bad mistake putting the ball in play and then in the second goal it was a result of bad positioning in defence. We had played really well for over 70 minutes.

"Obviously that's something that can't happen. We have to try to train more to avoid these types of mistakes and not to slow down at the end of games."