The player himself suggested it was not too serious, however. "But to be honest I'm not really concentrated on them", De Bruyne told Sky Sports.
A polyglot known for waffles, chocolate and beer, the nation of 11 million hopes for soccer to join the national identity, boosted by a golden generation that includes Romelu Lukaku, Eden Hazard and Kevin De Bryune. Fast, strapping and lethal.
Despite topping Group G with six points and a goal difference of plus-six, there is still the slimmest of chances Belgium might yet not qualify, though even a heavy defeat in their final game against England would be extremely unlikely to derail them. At the 2016 Euros, they wasted an early lead in a 3-1 quarterfinal loss to Wales.
Belgium has reasons other than fatigue to rotate its players. At least not within earshot of Roberto Martinez, who rolls out the all-for-one, one-for-all mantra like a 17th century manager of Musketeers.
Ultimately, however, any country looking to win the World Cup must beat the best at some stage.
Lukaku, meanwhile, did not train with Belgium on Tuesday and looks likely to be rested.
"Obviously they have a good team".
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Lukaku is positively whistling after two smartly taken goals against Tunisia, the first a drilled left-footer, the second an impudent dink over the keeper with his right, took his tally to 40 in 71 internationals at the age of 25, a rate bettered only by Neymar with Brazil. His brace vs Tunisia draws him level with Portugal talisman Cristiano Ronaldo who also has four goals to his name after bagging a hat-trick vs Spain and a victor vs Morocco. The Group G runner-up plays the victor of Group H.
Lukaku tied Cristiano Ronaldo for the tournament lead with four goals, becoming the first with consecutive two-goal games in the World Cup since Diego Maradona and Gary Lineker in 1986. "He did it again today and I'm happy I matched his performance".
"It must have been a great game to watch as a neutral but there are lots of things we need to work on and that starts tomorrow", he said.
"I think we will have Belgium's respect and we have our own ambitions of getting past the first round which Tunisia has never done before", coach Nabil Maaloul said. "On top, you have the talent and the quality, but since we came together, it's been a joy to see a group of players working so hard".
Belgium's Romelu Lukaku scores his side's second goal against Tunisia as Tunisia goalkeeper Farouk Ben Mustapha tries to save a ball during the group G match between Belgium and Tunisia at the 2018 soccer World Cup in the Spartak Stadium in Moscow, Russia, Saturday, June 23, 2018.
However, Courtois says it is important to continue building momentum throughout a tournament, while adding that the fact numerous Belgium players are facing their Premier League team-mates adds extra incentive.