Napoli reached the last 16 of the Champions League before losing to finalists Chelsea 5-4 on aggregate, but they will have to content themselves with a spot in the Europa League next season having finished fifth in the Serie A standings.
Their last chance of silverware comes in the Coppa Italia final against Juve on May 20.
"It’s a game that is worth the entire season," said Cavani.
“We are taking on a great team like Juventus, the new Italian champions, and we will give it our very best.
“We deserve to be in the final and we want to win it. Lifting that trophy would cap off an extraordinary campaign.”