The 33-year-old forward, who ended his nine-season stay at Real Madrid by moving to Juventus for £99million in the summer, is a five-time victor of the award.
Federation Internationale de Football Association split from the Ballon d'Or in 2016 to launch its own set of awards.
The Ballon d'Or will be presented to the victor in Paris in the month of December.
"The betting suggests Messi and Ronaldo's grip on the Ballon d'Or could be coming to an end this year as Luka Modric is odds-on to win the prize following his performances at the World Cup with Croatia and domestically for Real Madrid", said Coral's John Hill.
Ronaldo is the current defending champion, having won his fifth Ballon d'Or in 2017.
The Tottenham striker captained England to their first World Cup semi-final in 28 years in Russian Federation this summer.
Liverpool goalkeeper Alisson Becker has been included in the list alongside Manchester City striker Sergio Aguero.
Real Madrid midfielder Isco, Liverpool's Brazilian Roberto Firmino and Uruguay's rugged defender Diego Godin of Atletico Madrid also got the nod.