Barcelona's condition, which is not at its best, raises a little doubt that this team can survive longer in the Champions League. Barcelona may be able to beat Napoli who are slumping in Serie A, but will struggle when facing tougher opponents in the next round. I believe anything can happen in football, if you look at the performance of other teams such as Real Madrid, Bayern Munich and Manchester City it will be difficult for Barcelona to get rid of these teams.
With Barcelona's current condition, I even doubt that Barcelona will be able to beat Napoli in the last 16 of the Champions League even though Napoli themselves have not been good so far. Moreover, to get rid of other top teams such as Real Madrid, Bayern Munich and Manchester City, it will definitely be much more difficult for Barcelona with their condition not being good. Because the most logical thing for Barcelona now is to try to stay in the top four of La Liga for this season rather than hoping for more in the Champions League.
As the round of 16 approached, neither Barcelona nor Napoli were at their best. It is understandable why currently most football fans doubt Barcelona strength to beat Napoli in the round of 16, Barcelona inconsistency in La Liga is the main factor, and it is certain that their performance will not be much different in the Champions League. Napoli is actually much worse, the defending Serie A champions were even thrown out of the top four of the standings, if seen from that point of view, it is very likely that Barcelona can beat Napoli. As for the surprises that could happen, this is very normal in football, every club has its own luck and Napoli could beat Barcelona.
I fully understand Barcelona chances of going further in the Champions League this season, some clubs like Manchester City, Real Madrid or Bayern Munich have better strength, it's all thanks to the depth of the squad they have. Of course, if we compare the chances of these three teams with Barcelona, Barcelona chances of beating them are very low. Xavi and his squad need a miracle if they have the ambition to win the Champions League trophy this season, because three favorite teams has not shown any signs of a decline in performance.