Coutinho, 27, has been the talk of Germany since joining Bayern on a one-year loan deal from Barcelona earlier this week.
The move, which could start a trend of Brazilians playing for China, has divided football fans in the world's most populous country.
Al Sadd were made to work hard by 10 men Al Wakrah.
Duhail were down by a goal till the 88th minute
Wakrah made champions Sadd sweat despite playing with 10 men for the most part of the game.
The former French international left Bayern Munich as a free agent last May after 12 seasons.
The move has divided Chinese football fans and experts, however, as coach Marcello Lippi attempts to guide the nation to only their second World Cup.
Serie A runners-up Napoli have not held the Scudetto aloft since Argentine legend Diego Maradona inspired them to their only titles in 1987 and 1990.
The logo for the 2022 event will be unveiled on September 3.
Xavi’s men take on Al Wakrah in the opener