Napoli boss Rafa Benitez was unhappy with defeat to AS Roma.
Miralem Pjanic struck the only goal of the game for Roma.
"The team put in a good performance and were denied by some great Morgan De Sanctis saves," Benitez told Sky Sport Italia .
"We did what we were supposed to and I am convinced that if we continue playing like this then we can still target the Champions League.
"We only allowed Roma too much room on the counter once or twice, but overall the game was always under our control.
"I replaced Gonzalo Higuain because the team was attacking a lot, especially down the flanks, and Duvan Zapata had the qualities suited to that kind of approach.
"Am I shocked to be nine points behind Roma? Yes. Our team is growing and plays good football, but at times lacks the maturity to deal with certain situations."