"King Philippe and Queen (Mathilde), as well as Minister of Foreign Affairs Didier Reynders, will arrive in St. Petersburg to support the national team," an employee of the Belgian Consulate General in Russia's second-largest city said on Monday, reports Sputnik news agency.
Belgium, who reached their first World Cup semi-finals in 32 years, will take on 1998 champions France at the St. Petersburg Stadium on Tuesday.
France look to return to the final of the World Cup for the first time since 2006, while the Belgians look to confirm the promise of their 'golden generation' and reach the final for the first time.
The Belgians have won all five of their matches in Russia, scoring 14 goals and leaving Brazil and Japan by the wayside. In the quarter-final against Brazil, they showed their adaptability and in the last 16, they showed their resilience by fighting back from 0-2 down against the Japanese.
Belgium coach Roberto Martinez has shown that he can make changes to his system, using a 4-3-2-1 for most of the tournament, but adapting to a 4-3-3 to exploit Brazil's weaknesses down the flanks.
Martinez has succeeded where his predecessors failed by making the team greater than the sum of its parts. The Spaniard has shown great tactical pragmatism by setting up his side to suit the characteristics of his best players and exploit the weakness of opponents.
The French drew one group game (against Denmark), but their World Cup has been one of constant progression built around goalkeeper Hugo Lloris, central defenders Raphael Varane and Samuel Umtiti, and midfielders, N'golo Kante and Paul Pogba.
Olivier Giroud provides a focal point in attack. Add to that the pace of Kylian Mbappe and Antoine Griezmann, who will also drop back to help in the middle and Didier Deschamps has a team without any apparent weaknesses.
France will have to be wary of Eden Hazard and Kevin De Bruyne's pace on the break. Martinez and his players have already shown they can change their formation depending on their rivals and Tuesday promises to be an absorbing tactical battle.