The "BVB" smoothed the way for their win with three first-half goals, while Dominic Volkmer's red card before half-time left Duisburg hopeless.
The region's qualifiers are scheduled to begin in October, more than six months later than originally planned because of the global health crisis.
"What happened was a conflict between Messi and the club. I have spoken to Messi and we are carrying on as normal," said the Barca boss. Enditem
The single-leg match was played behind closed doors at Sammy Ofer Stadium in the northern city of Haifa.
Internacional lead Group E, three points ahead of second-placed Gremio, who lost 2-0 at Universidad Catolica in Chilean capital Santiago.
When asked about Suarez, who was also left out of a friendly against Gimnastic Tarragona at the weekend, Koeman said he had "spoken to him about the future and whether or not he will stay."
Fans can't wait for Erling Haaland, Jude Bellingham, Jadon Sancho, Real loanee Reinier, Giovanni Reyna and wonderboy Youssoufa Moukoko to get the engine running at full speed.
Following the decision by the AFC's COVID-19 sub-committee to withdraw Al-Wahda and render their matches null and void, Al-Ahli found themselves in need of just three points to guarantee a top-two spot in the now three-team Group A.
"I just wanted to be on top of the leaderboard," Duplantis said. "The 6.15m was really important to me, so I'm happy to get over that."
The 26-year-old Wang from Guangdong took the pole position in a three-man leading group in the early stages of the race and soon broke clear to seize a comfortable sole lead. The 2018 Asian Games champion never looked back until breaking the tape in style with a clocking of one hour, 20 minutes and 49 seconds.
Duisburg tried to keep pace but the "BVB" continued their relentless march, as Giovanni Reyna's deflected free-kick left goalkeeper Leo Weinkauf helpless five minutes into the second half.