The Belgians arrive in Brazil tipped as dark horses for the tournament with what is being heralded as a 'golden generation' that includes Hazard, Romelu Lukaku, Vincent Kompany and Adnan Januzaj, among others.
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"Nobody is guaranteed to start the game [against Algeria], even Hazard," Wilmots told Sportwereld.
"Each player is perfectly replaceable."
However, when asked whether he had already settled on his starting line-up for their World Cup opener, the coach replied: "Of course - but I do not want you to know the team.
"I've also been through, as an analyst, the guesswork for the team. Now it's up to you to guess.
"This is a World Cup. I want to play hide and seek."
Wilmots's men kick off their campaign against Africa's top-ranked side, Algeria, before coming up against Russia and South Korea in Group H.