I don’t think is only the defense is the main problem of Barcelona, the entirely team have their own their problems and that’s why their performance is going in that way; since their try their much effort and able to claim the top of standing this is the right time for them to maintain their points and keep their mentality so strong, but their still fuck up by allowed a team like Atlético Madrid leading them to a drew in their last match. Which was very disappointment from them, because even me I wasn’t expecting that kind of performing from them.
The high tension of the game and the ambition to beat each other will make the club or some players a little mentally deficient in playing which in turn makes some unexpected mistakes and for me it is a normal thing.
What Barcelona and Atletico did was actually quite good despite the mistakes made in the end they also did the maximum in 90 minutes of the match only there were some moments that did not match expectations.
With the tension of the game like that plus for some young players who may still not be used to big games even though they have done it then things that are not expected can happen but the most important thing for now is that they can fix it in the second leg later.
The first leg was very good so there is something that might be a big expectation in the second leg especially considering the performance of these two clubs is still quite good although there are still some things that need to be improved.