The Midlands club have won their first three games in the competition so far this season.
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However, Onana knows there is still a long way to go in the group stages and that his side faces a tough game against the Belgian outfit.
“I’ve never played a professional game in Belgium, I moved from here when I was 15, went abroad to Germany, France and now England,” he said.
“It will be my first official (club) game here in Belgium, I can’t wait for it.
“I’m used to it because I come back here with Belgium and play with the national team.
“I’m excited, looking forward to it.”