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Barcelona certainly won't waste this opportunity to play at home, it will certainly be an interesting match, because in the domestic league Napoli doesn't look good so Barcelona can take advantage of their current declining performance, Xavi must be able to take advantage of that by putting pressure on his players to being able to play optimally and win the match in the second leg, at least a narrow win is more than enough to qualify for the next round.
I am confident that Barcelona can qualify for the next round. It seems they will overcome Napoli at home of course with a different strategy, learning from the failure in the first leg where Barcelona was held to a draw by Napoli, it is clear that this is something that is not profitable, I think Xavi has prepared a strategy which is good for facing Napoli in the second leg match later, my prediction is that Barcelona will probably win 3 - 1 against Napoli in the second leg match later and they will succeed in qualifying for the next round because they are quite worthy of advancing compared to Napoli.
Xavi must be able to find a solution for his team defense line, so that it is not porous and easy to concede. If this can be realized, I also tend to think that Barcelona will win in the second leg. Acting as hosts will certainly make Xavi's fleet lucky, because they will get full support from their fans, Napoli will definitely find it difficult to win the match.
Apart from that, Barcelona and Napoli must first complete two other matches in their respective domestic leagues. I think these two matches can be taken into consideration, if you want to bet on both matches later. On paper, Barcelona deserves to be at the top, and Napoli could possibly make a surprise. The change of coach makes Napoli a little different, they just won big in Serie A.
On the other hand, Barcelona and Napoli, whoever can qualify for the quarter-finals, these two teams are not favorites to advance to the final. Because many believe that the strength of Man City, Madrid and Bayern is still stronger. But we have seen the history of last season, where Inter advanced to the final even though they were not the favourites.