"As a coach I couldn't be prouder," said Martinez. "We played against the best team in Europe in 'knowing how to win'. It was the biggest test there is."
Belgian football journalist Kristof Terreur told BBC Radio 5 Live: "We have been number one for 1,000 days but we haven't won anything. We have to deliver now. It is now or never for this generation.
"The real feeling I had in Russia [at the 2018 World Cup] that we were going to do it, I don't feel that now. This is tough.
"But we have winners in every position now and they have people around them who are winners. [Belgium coach] Thierry Henry, for example, was a winner and he has helped Romelu Lukaku become a winner."
Former England winger Chris Waddle added: "Looking at this Belgium team on paper, if they don't win this tournament there is something wrong.
"They have quality everywhere. I would not want to play Belgium whoever I was. Other teams looking at this draw will not want Belgium.
"Belgium will never have a better chance of winning a tournament than this.