Napoli coach Maurizio Sarri says he was satisfied with the first hour of the game against Sampdoria, less with how his side allowed the visitors to restore parity.
The Partenopei were enjoying a two-goal lead after Gonzalo Higuain's brace but a number of defensive mistakes allowed Sampdoria to first restore the deficit and then equalise to register a shock result at the Stadio San Paolo.
"The first 55 minutes of the game were quality," Sarri told reporters.
"It was a huge step forward compared to last week's game against Sassuolo. But we allowed them to bounce back after we conceded the first goal.
"But I'm happy with what I saw, we're still not fit enough for the full 90 minutes so we're making mistakes and we're paying for it.
"I don't want to talk about individual mistakes, in the same way I say that we did well in the first hour of the game, I also say that we lost concentration after the penalty, a soft one in my opinion.
"We played against a team [Sampdoria] that are ahead of us in respect to fitness level [since they featured in the Europa League play-off] but I believe we could have done better in terms of the mental aspect of the game."