Napoli coach Gennaro Gattuso says they didn't do themselves justice in defeat at Barcelona.

The visitors lost 3-1, going out 4-2 on aggregate in this Champions League round 16 tie.

“There are many regrets, because we had a blackout for half an hour, conceded three ridiculous goals and made some very serious errors during that period," Gattuso told Sky Sport Italia.

“I saw a team that also put Barcelona under huge pressure. We should've scored two goals early, yet we conceded instead. It angers me to concede a goal from a set play. It drives me crazy.

“I always say, we have some strong and talented players, but need to really move forward in terms of mentality, because it's not good enough.

“If you look at the statistics, it was dominated by Napoli. We had double their shots on goal, had more possession, we broke through their defence very easily.

“You could see Barcelona were really struggling in the second half. I heard people say Barcelona were playing with their reserves, I didn't see that today, it was a quality squad worth hundreds of millions. We played as a team, but the biggest regret is that we fell asleep for half-an-hour and gifted the tie to Barcelona," continued the coach.

“Barca didn't get out of their half in the opening 10 minutes. I saw more than a good performance from Napoli. I am not trying to cause controversy, I am just disappointed, because I saw we could really hurt them. I get the feeling we were up against a Barcelona side that was not in good shape and we handed it to them.

“With a little more determination and a stronger mentality, we could've really done damage here. We knew that with tight passing, we could break through the lines and hurt them, but we got the passes wrong. I'm angry because we did these things well in the second half and not enough in the first."