Both Barcelona and Napoli are struggling, performance-wise. Their underperformance makes this match more uncertain. Barcelona has been inconsistent this season, especially against clubs they should have easily defeated. Inconsistency could be their downfall or incentive to prove everyone wrong. Barcelona's difficulties against smaller clubs in La Liga may be the motivator they need to beat Napoli.
Conversely, Napoli's key players arent performing as expected. This match is Barcelona's to lose due to their home advantage and need to recover from La Liga. Football is unpredictable, so Napoli may get the break they need. I believe a tough encounter could end in a tie. Barcelona must fix their inconsistencies to win and advance in the Champions League.
Domestically, Barcelona is more pre-ready to knockout Napoli in these League than Napoli is ready to trash Barcelona. The fact that Napoli is sitting in number 7 in the Seria A makes me have less confidence in them than Barcelona who is now in form coming for Real Madrid in the Laliga table and since Xavi want to take his leave after the season, conquering this league to the end might be one of the dearest things for him to achieve before offset into another club.
So far from the beginning of this season, they didn't started well, they have win 12 matches, draw 8 and loss 8, that's average performance in my dictionary But Barcelona has gotten only 3 loss which is fair. However, Napoli looks solid in their last 5 games but Barcelona are solid as well, there is no way that Napoli is going to win Barcelona this week except if Barcelona decided to shame LaPorta as usual.