Poland is also assured of finishing in the top two of Group G, where second-placed Austria boosted its hopes of qualifying with a 1-0 win at Slovenia.
Lukaku took his record Belgium international tally past 50 goals as Roberto Martinez's Group I leaders opened up an unassailable 11-point lead.
Tourism is a pillar of Croatia's economy, with visitors flocking to hundreds of islands and islets along its stunning Adriatic coast.
Modric beat out Liverpool's Egyptian forward Mohamed Salah and Ronaldo, who along with Messi did not attend the glitzy awards ceremony in London.
The comment came after Modric was named as UEFA Best Player of the Year and earned a nomination for FIFA's 2018 Best Men's Player award.
More than 100,000 people thronged the square to hail 'Vatreni' led by captain and World Cup Golden Ball winner Luka Modric.
Crowds began converging early Monday on the Champs-Elysees, the gathering point for all national celebrations.
More than 100,000 red-and-white-painted Croatian fans were expected to welcome the squad home later Monday in the capital Zagreb.
With a population of around 4.5 million, Croatia became the smallest European nation to reach the World Cup final in the 88-year history of the competition.
Tens of thousands of people are expected to attend the celebrations at the central square in the capital Zagreb on Monday after the players fly in from Russia.
France's 4-2 win over Croatia in the World Cup final in Moscow on Sunday marked the second time in 20 years that France has won the World Cup.
The scoreline — France scored four to Croatia’s two — might suggest a stroll for Le Bleus but it was anything but.
On the final whistle applause from tens of thousands of Croatian fans rang out through the capital's main Jelacic square as many lit flares and set off firecrackers.
Modric was named man-of-the-match three times in Croatia's seven games in Russia, but even the Real Madrid midfielder was powerless to stop France's firepower.
France are world champions for the second time as Les Bleus ran wild while Croatia's energy reserves ran dry to win a thrilling final.