Napoli made a disappointing Europa League exit, but Carlo Ancelotti backed his players.
Linked with a move to Manchester United, Kalidou Koulibaly's focus is on the end of the season with Napoli.
Aaron Ramsey's hamstring injury soured an otherwise excellent outing for Arsenal as they booked a place in the Europa League semi-finals.
Arsenal have faced questions over their collective mentality in the past but Laurent Koscielny felt a strong spirit was clear at Napoli.
Arsenal boss Unai Emery will face former club Valencia in the Europa League semi-finals after Alexandre Lacazette sealed victory at Napoli.
Arsenal's Aaron Ramsey went off after seeming to injure his hamstring against Napoli, meaning he may have played his last game for the club.
Sokratis Papastathopoulos has enjoyed a strong debut season at Arsenal and Unai Emery is depending on him against Napoli.
Napoli can overturn a 2-0 deficit and eliminate Arsenal from the Europa League quarter-finals, according to Carlo Ancelotti.
Kalidou Koulibaly scored a brace as Napoli picked up their first win in four games in all competitions, beating relegated Chievo 3-1.
A surprise defeat away to SPAL prompted Massimiliano Allegri to take aim at critics of Juventus, reminding them of his team's consistency.