Belgium winger Jérémy Doku will miss their second World Cup group game against Iran on Sunday.
A post on X from the team said his absence was "due to illness." Media reports said it was a respiratory tract infection.
Belgium drew 1-1 with Egypt in their first Group G game on Monday, when Manchester City's Doku was a rare bright spark.
The Red Devils sit third in the table before facing Iran in Inglewood, Los Angeles.
