Belgium's "Golden Generation," once considered one of the most talented groups of players in world football, have struggled to build on the promise of their third-place showing at the 2018 World Cup, but that is not De Bruyne's main gripe.
"I can accept that we're not as good as in 2018," the Manchester City star said. "I was the first to see that, but other things are unacceptable. I'm not going to say what."
De Bruyne also criticised Belgium’s tactical setup, suggesting that the team’s style of play is hindering their ability to perform at their best.
"We are too many at the back. If you stay with six at the back, there is no connection," he reasoned. "It is what it is. It is not about transition, but about people who do not perform their tasks."