Manchester - Barcelona head coach Luis Enrique admits his side was made to pay for a series of errors as Manchester City clinched a 3-1 victory in the Champions League on Tuesday night.
Enrique's men started the match on the front foot and claimed the lead after 21 minutes, Lionel Messi netting his 90th goal in Europe's premier club competition.
However, the Citizens turned the game on its head when Ilkay Gundogan equalised in the 39th minute, with Sergi Roberto being made to pay for a wayward pass in the build-up to the goal.
And the hosts picked up where they left off after the break, Kevin De Bruyne fired City into the lead on 51st minute, before Gundogan netted his second of the game to put the result beyond doubt.
Reflecting on what was a disappointing second-half showing and result, Enrique told reporters: "We played 40 spectacular minutes, especially on this stage against a top rival. But we committed a key mistake and that hurt us because we are not machines.
"It's a shame that we have made that error for the first goal and from there on we had a tough time.
"When you concede like that, it's normal that you have a bad spell. During that moment we wanted to continue to dominate the game, but it wasn't possible because of errors we made and pressure from City, too.
"We didn't have much of the ball and City took advantage of our errors. We just couldn't control the game in the same way and the result reflects that: first 40 minutes for us, the rest for them."
He added: "I'm not worried or surprised, they're things which happen in football. If things don't go to plan after playing well for 40 minutes then it's a strange feeling, but [City] played really well. They provoked more errors than us."