Napoli threw away 2-0 and 3-2 leads to only manage a 3-3 draw at home to Udinese but Rafa Benitez believes they will be much more focussed against Arsenal.
The Partenopei started the season very brightly and appeared to be title contenders, but recent results, including a home defeat against Parma and this draw with Udinese have allowed Juventus to break clear at the top.
There were warning signs for Napoli ahead of their Champions League clash with Arsenal as two of Udinese's goals were the clear result of defensive mistakes.
Benitez was clearly dissatisfied with his side's performance in his post-match press conference but promised a better showing against Arsenal.
"The fans should be angry with us above all if the players don't run and don't work hard but they did do that," the Spaniard said.
"However, we lost concentration for set-pieces and against Arsenal it will all be different. We need to be perfect against the Gunners - we need to play with intensity and to not make errors in defence.
"We have had a good Champions League campaign. We were drawn with Arsenal and Borussia Dortmund and we are going into the last game with everything to play for.
"We have to manage games better. At 2-0 up it looked easy but we made more individual errors than errors as a team."
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