The teenager believes if the champions had managed to consolidate the two-goal advantage for longer, it would have made all the difference.
Ultimately, the hosts’ ability to stretch City meant the one-man advantage cost Pep Guardiola’s tiring side.
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“We are disappointed, because we were very close to get at least one point,” said Garcia.
“When we scored our second goal, we were a bit unlucky because they scored the first goal really quick, they started pressing really high, then the second one nearly at the end and with all the pressure the third one at the final stages.
“Playing 80 minutes with ten men, the pressure of the stadium, at the end everything helped them. We have been very unlucky.
“They are showing they are a great team. They work really hard and they have really good players. It's difficult to beat us and they did it twice, so all the credit to them.
“We just need to keep working hard. We have a game tomorrow and we need to recover, learn from the mistakes, focus on the good things we have done and carry on.”