Belgium striker Lukaku has scored 12 times and set up 10 more in Italy's top flight this season and has been key to Napoli's battle with reigning champions Inter for the league title.
Belgium striker Lukaku nodded home his eighth Napoli goal from Andre-Frank Zambo Anguissa's perfect cross in the 78th minute to give Antonio Conte's team a statement win in Bergamo.
"It's too early to talk about the title. All we can do is look out for how we develop as a team, work to improve and win every match we play. But now is not the moment to talk about the title," said Lukaku.
Antonio Conte's resurgent side wrapped the match up inside the first half, courtesy of an early Romelu Lukaku goal and a sensational strike by Khvicha Kvaratskhelia.
Belgium striker Lukaku completed a permanent move to Napoli from Chelsea on Thursday, ending a long period of limbo with the Blues.
Kevin De Bruyne was included in Belgium’s squad for next week’s Nations League matches but Romelu Lukaku was omitted after asking for time off to concentrate on getting fit after his move to Napoli, coach Domenico Tedesco announced on Friday.
Napoli have signed Romelu Lukaku from Chelsea, the Serie A club announced on Thursday, ending the Belgium striker's extended period in limbo with the Blues.
Paulo Dybala picked out Lukaku with a clever cross as the Belgium striker headed Roma in front in the fifth minute at the Stadio Olimpico.
Bruno Fernandes and Ricardo Horta netted the goals for Roberto Martinez's Portugal, with Cristiano Ronaldo not on the scoresheet, to end with 10 wins from 10 matches in Group J.
Romelu Lukaku should be available for Inter's Milan's Champions League clash with Viktoria Plzen which could seal the Italians' place in the last 16, coach Simone Inzaghi said on Tuesday.
Inter Milan made it two from two in Serie A with Saturday's comfortable 3-0 win over Spezia on Romelu Lukaku's return to the San Siro.
Forward Romelu Lukaku scored on his debut for Inter Milan as they made a flying start under new coach Antonio Conte with a 4-0 win over promoted Lecce in Serie A on Monday.
Ole Gunnar Solskjaer's Manchester United made it four wins out of four in the Premier League on Wednesday, beating Newcastle to close the gap on fourth-placed Chelsea, who were held at home by Southampton.
Football is played in cycles, although they do not change often.
"Everyone thinks Romelu Lukaku is just about goals, goals, goals, but I want to be seen as an all-rounder" says Lukaku.
Roberto Martinez reveals that Romelu Lukaku is an injury doubt for Belgium's World Cup blockbuster tie against England after the in-form striker picked up an ankle injury.
Belgium's creativity and power prove too much for World Cup debutants Panama as the Group G favourites overcome the heroics of goalkeeper Jaime Penedo and a massed defence to run out 3-0 winners on Monday.
Manchester United manager Jose Mourinho is confident Romelu Lukaku's problems in front of goal will come to an end -- just as soon as he secures a new boot deal.
Manchester United striker Romelu Lukaku enters a not guilty plea after being cited for holding a rowdy party at his rented Beverly Hills mansion in July.
