Napoli will have to "climb Everest" if they are to overcome Barcelona in their Champions League last-16 tie this weekend, says Gennaro Gattuso.
Following a 1-1 draw in Italy back in February, Barca have a narrow advantage due to the away-goals rule ahead of the return game at Camp Nou on Saturday.
The Blaugrana have been disappointing since the restart – they surrendered a two-point lead in La Liga to finish five adrift of eventual champions Real Madrid – leading to speculation over head coach Quique Setien's future.