Wilmots is expected to name a preliminary squad of 26 to 27 players on May 13 and whittle that down to a final 23 on June 2.
However, he said in an interview published in Het Laatste Nieuws newspaper on Wednesday that there were five players he would always pick assuming they were fit.
They were Manchester City and Belgium captain Vincent Kompany in central defence, creative Chelsea winger Eden Hazard, Atletico Madrid goalkeeper Thibaut Courtois and midfielders Axel Witsel of Zenit St Petersburg and Kevin De Bruyne, Belgium's top scorer in qualifying who moved to VfL Wolfsburg from Chelsea in January.
"I have no doubts about Marouane. I don't understand why Manchester United bought him to play him in a system of two number 6s. Marouane is a box-to-box player. The World Cup is a good chance for him to take revenge," he told the paper.
Belgium, playing in their first World Cup in 12 years, will face Algeria, Russia and South Korea in the group phase in Brazil.
- Sports & Recreation
- Marouane Fellaini
- Vincent Kompany
- Manchester United
- Eden Hazard