If it were to be last season I doubt if Napoli will struggle to win the current Barcelona who has a weak form currently, but then both teams currently are unstable and inconsistent especially in their various local leagues, but in the UCL so far, they didn't do poorly in their group stage matches so I will not want to judge them completely based on their performance currently in their various domestic leagues as it seems in the UCL the give off a different performance hence it could be possible they will do better in the game than we have expected but it's not going to be an easy one for both teams.
It is clear that the knockout round is more difficult than the group phase, all contestants will try their best to beat each other from the first leg. no team can be guaranteed that they will advance to the quarter-finals, because we have seen so many surprises happen so far. Several other favorite teams have also experienced ups and downs in performance, therefore the room for surprises is wide open.
The transfer window must be used as an alternative solution to increase strength, but what needs to be paid attention to here is recruiting players who are mature and experienced. because when the competition is running at the current stage, the adaptation period should not be a new challenge, because the recruitment of new players is expected to have an instant impact on the club.