5 reasons why Barcelona will once again fail in the Champions League this season

#2 Average form

Quique Setien's men are struggling to impress

The manner in which Barcelona started the season clearly demonstrates that they have become weaker. The Catalans started the season in unwanted fashion as they fell to a 1-0 defeat at the hands of Athletic Bilbao and they've been on a downward slope ever since.

Quique Setien's men were recently sent packing from the Copa del Rey by the same side that denied them a good start to the season - with the same scoreline. They are now playing catch-up with Real Madrid in the La Liga title race after slipping from the top spot following their recent 2-0 defeat at Valencia.

Their Champions League group stage outing was also not impressive. They drew two of their six fixtures and won with a one-goal margin in three of their four victories, struggling against the likes of Borussia Dortmund, Inter Milan and Slavia Prague. The test against Napoli won't be a ride in the park and even if they manage to scrape through, bigger ones lie ahead.