Napoli boss Rafa Benitez admits they suffered for their mistakes in defeat to Champions League opponents Athletic Bilbao.
Athletic won last night's second-leg 3-1 to reach the group phase.
"In an objective analysis, Athletic deserved to score in the first half and did not," Benitez told Sport Mediaset.
"We took the lead, but in a few minutes we made some important mistakes and lost control of the game. We made mistakes on all three goals.
"Those goals allowed Athletic to gain confidence and we lost ours. Do I blame anyone? No, these are mistakes that happen.
"These can happen - they are not normal, but they happened anyway. We had worked over the week on specifics like corners, but we still made mistakes and clearly still have work to do.
"Have our plans changed? No. We said from the start Athletic were a tough team. We knew it could end up like this, we are all disappointed, but we have to look forward."
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