Napoli coach Walter Mazzarri says the Coppa Italia is a priority ahead of tonight's semifinal against Siena.

The Partenopei need a win to reach the Final, having lost the first leg 2-1 at the Stadio Artemio Franchi.

"A very difficult game awaits us and we have got to win it all together," said Mazzarri.

"The fans must help the team and I hope we'll have a full house cheering us on, especially as we need to overturn the result."