What Unai Emery said after his win.

Although Arsenal won the first leg of the Europa cup quarter final against Napoli, Arsenals coach Emery still believe that his team must work hard in the return leg at Italy.

Its a good result but we have a big respect for them away. The first 90 minutes here, we can impose the result and our game plan, Arsenals head coach said to BT Sport.
We suffered some times, they can control with possession and created some chances, but we work well in this moment in the season and finished the match.
We know [there is] another 90 minutes and away there is a different match. We need to be focused, clear and not more confident than we need [to be] to respect them.