Manchester City manager Roberto Mancini insists his team did not lose concentration against Real Madrid but were guilty of a mistake.
Jose Mourinho's side scored two late goals through Karim Benzema and Cristiano Ronaldo to turn around the Group D game in the UEFA Champions League and win 3-2 in the Bernabeu.
Aleksandar Kolarov had looked to have scored a late winner of his own after Edin Dzeko and Marcelo had traded goals.
But City caved under pressure and Mancini feels they will come back stronger for the experience.
"We didn't lose concentration," the City boss told Sky Sports.
"We went too deep with the team. All it is, is a mistake.
"In this moment we are disappointed but I think everything has to be more strong in the future."
Mancini had some difficult tactical decisions to make as he lost both Samir Nasri and Maicon to injury and the Italian feels that denied him the chance to use Sergio Aguero from the bench.
He added: "We lose two players for injury - Nasri and Maicon.
"And we had a problem because we wanted to change Aguero because we wanted to attack more. Instead we should do this change."