The Group A leaders know a win in Glasgow on Friday will take them a long way towards playing at the World Cup in Brazil, but Wilmots will be forced to do without Manchester City's injured Vincent Kompany and is likely to replace him with Zenit Saint Petersburg's Nicolas Lombaerts in defence.
"The players already know who is going to play against Scotland," he said. "I will not disclose my team, but they all know who is going to play. That way, they can prepare for the game in the best circumstances."
If Wilmots caps Zakaria Bakkali, the 17-year-old would then be tied to Belgium rather than the country of his birth, Morocco. The youngster, who plays with PSV Eindhoven, is in the squad but Wilmots said he hadn't yet made his mind up. "Zakaria has not yet made his choice," he said. "Nothing is certain as long as he has not played. He must choose with his heart."
He also had no concerns over the mindset of Marouane Fellaini, who has just completed a £27.5m transfer to Manchester United. "Marouane was allowed time off to complete his move. Now he must focus on Friday."