Edinson Cavani stretched his tally to a league-leading 27 goals as Napoli secured Serie A's runner-up spot and Champions League football next season with a 3-0 win over Bologna on Wednesday.
Napoli are 11 points behind Juventus, who secured their 29th league title last weekend and beat Atalanta 1-0 for their 27th win of the campaign, but cannot now be caught by AC Milan who are seven points adrift.
"We're really happy about second place, it's like a Scudetto for us," Slovakian midfielder Marek Hamsik, who scored Napoli's opener, told Sky Sport Italia.
"Now we're in the Champions League."
With Cavani a target for several top European sides, Hamsik admitted, however, it would be strange to play in the competition without the free-scoring Uruguayan.
"It's difficult to think we could be without him next season, but that's football and we just have to get on with it."
Elsewhere Inter Milan's hopes of playing any kind of European football next season were derailed by a 3-1 defeat at home to Lazio.
Inter were the last Italian team to win the Champions League, under Jose Mourinho in 2010, but their 15th defeat in what has been an injury-plagued campaign left them 33 points behind Juventus and seven behind fifth-placed Udinese in the final Europa League spot as Lazio moved up to sixth.
Inter had a terrible start when 'keeper Samir Handanovic turned the ball into his own net following a cross by Antonio Candreva.
The hosts levelled just after the half hour when Ricardo Alvarez beat Federico Marchetti with a header which left the forward nursing a sore face.
Inter missed several chances and paid the price when Lazio were awarded a penalty on the stroke of half-time following Andrea Ranocchia's blatant trip on Sergio Floccari.
Anderson Hernanes stepped up to give Lazio the lead and Inter suffered more misfortune in the second half when Alvarez slipped and missed from the spot after Fredy Guarin had won a penalty.
Lazio virtually killed the game off when 20-year-old Nigerian Ogenyi Onazi, a second-half substitute, scored a screamer from 25 metres.