Belgium defender, Vincent Kompany, will remain with the squad despite being sidelined by a groin injury, said coach Roberto Martinez.
The Manchester City captain has not played since suffering the injury in a friendly draw with Portugal two weeks ago.
He is not expected to be fit until Belgium's final group G game against England in Kaliningrad on June 28.
"We are going to maintain the squad of 23 as announced," he said.
Martinez could have made a change to his squad on Sunday, the day before Belgium begin their World Cup campaign against Panama in Sochi.
"We are not going to use any changes," said the former Everton boss. "Vinny has evolved better than we thought, even though we thought that he could have a good opportunity to be involved in the group phase.
"Now he has a stronger opportunity."
Martinez said Kompany is "a very valuable part" of his squad due to his "experience" and "know-how."