Manchester City goalkeeper
The Premier League champion was six minutes away from a memorable victory at the Bernabeu before a late turnaround saw it crash 3-2 in its UEFA Champions League opener.
Former Manchester United star
Hart told ITV: "You can't go 2-1 up with five minutes to go and lose the game. Who else can we blame? We can only blame ourselves.
"We dug deep, got a lead twice and we lost it, so we can only blame ourselves.
"It's hard to come off the field after losing 3-2 and be positive. I'm really sorry.
"We're not a team that should come here and pat ourselves on the back for doing well. We're a team that gets results."
While Hart's comments might have been an honest appraisal of the match, manager
Speaking in his post-match press conference, Mancini said: "
"If anyone should criticise the team, I should criticise the team, not
City was second best for most of a compelling Group D clash but remained on level terms - mostly thanks to Hart - until
Marcelo converted one of a number of chances to level but City looked like snatching victory when Xabi Alonso's outstretched boot was unable to prevent
But the host produced a rousing finale and Gonzalo Higuain equalised from the edge of the area before Ronaldo had the final say.
Mancini said: "It is difficult not because we lost - we can lose against a side like Real Madrid - but because with four minutes to go it was 2-1.
"This is strange. I think we need to improve this situation.
"Sometimes we go too deep. We made some mistakes and I don't want us to continue defending like this.
"In the first half they played better than us but in the second half we played well and scored two goals.
"When you score two goals here and are 2-1 you should pay more attention."
City is only in its second Champions League campaign and failed to make it past the group stage last season.
Further tough games against Ajax and Borussia Dortmund lie ahead but Mancini will not use inexperience as an excuse.
He said: "We can't continue to talk about experience. We have good players who play for their international teams. They play a lot of games.
"I think I am happy for our performance in the second half but I think we can improve and we should be disappointed that we lost."
Real Madrid boss Jose Mourinho felt his side's late turnaround, and its overall performance, were the ideal riposte to its critics.
The Spanish champion had gone into the game under pressure after an underwhelming start to its Primera Liga campaign in which it had won just once in four games.
Mourinho, who celebrated the winner by sliding on his knees, said: "In my brains were a few computers - delete everything that was ready to be written and write again.
"It doesn't matter about my celebration, what mattered was the match and the way people who love football around the world enjoyed this match for sure.
"For me as a coach, more important than the win is to be proud of my team, whatever the result.
"I kept saying as things were not going in the right direction that Real Madrid can lose matches like tonight's, Real Madrid can lose matches fighting like animals.
"But Real Madrid cannot lose matches like the match in Getafe or the match in Seville."
UEFA Champions League
UEFA has announced that the Champions League final in 2015 will take place in Berlin's