Napoli lost their slim chances to participate in European competitions next season when they were held to a 0-0 home draw by Lecce in their last Serie A game of the campaign on Sunday.
Last season's champions Napoli finished 10th on 53 points, level with ninth-placed Torino who were beaten 3-0 at Atalanta in a simultaneous kick off on Sunday.
Despite their loss, Torino can now still earn a Europa Conference League playoffs spot if eighth-placed Fiorentina, who have a game in hand, win the Europa Conference League.
Fiorentina face Greece's Olympiacos for the title on Wednesday.
Napoli needed a win to maintain their European hopes but despite 24 shots, five of them on target, they ended their disappointing campaign winless in their last seven games.
Substitute Cyril Ngonge had a good chance to give Napoli the lead just after the break but his shot from the edge of the box was saved by Lecce goalkeeper Wladimiro Falcone.
Jens Cajuste hit the far post with a low strike shortly before Ngonge hit the bar in the 64th minute.
Europa League winners Atalanta, meanwhile, secured at least fourth spot after Gianluca Scamacca, Ademola Lookman and Mario Pasalic were all on target in a 3-0 win against Torino.
They sit fourth on 69 points but can still leapfrog third-placed Juventus, on 71 points, if they beat Fiorentina in their last remaining game next Sunday.--REUTERS