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Even with those problems, they managed to draw with Barcelona. I don't think Barcelona have any serious problems that prevent them from winning, at least they are playing better than Napoli. Napoli are awful this season, as their play shows, I'll be surprised if they go any further
Both teams are equally bad in terms of consistency, but Barcelona is certainly better than Napoli. As bad as Barcelona's performance is, they are still a team that has the possibility of qualifying for the Champions League next season. Currently Barcelona is in 3rd place in the La Liga standings and they also have the potential to take second place from Girona if Girona loses points in the next match.
Napoli are not very reliable in the Champions League and basically they are more likely to fail to qualify for the quarter-finals. I think Barcelona will qualify for the quarter-finals, they have a good performance to be underestimated.
I saw two different games in two different halftimes to be honest. In the first half there is no doubt that Barcelona should have probably taken the lead by at least two goals. But when they had this single goal, I thought all the time that this could backfire as we should keep in mind that Napoli has its own Lewandowski who can score anytime and that is what Osimhen did. And when you see how the game went after that Napoli goal, I think if they won the game eventually it wouldn't even have been undeserved. They had their fair amount of chances and offensive pressure. That's Barcelona's biggest weakness. They play well, don't score and then concede goals.