Having played for Juventus for four seasons, the 33-year-old joined Bayern Munich in 2015, before moving to Barcelona in 2018.
"We could see sport is coming back slowly but surely," Bach said. "A number of big sports events have been successfully organized recently, including matches of Japanese leagues at the weekend and also some complex events like Tour de France."
Milan doubled the lead four minutes after the break as Ismael Bennacer was charged down by Riccardo Orsolini in the box, Ibrahimovic stepped up to convert the penalty.
Brazil has the world's second-highest COVID-19 death toll behind the United States, with more than 139,000 fatalities. Enditem
Instead, goals were scored at the other end of the pitch, as Lucas Tousart's foul on Sebastian Rode allowed Daichi Kamada to curl the subsequent free-kick into the path of Bas Dost, who nodded home from close range in the 36th minute.
Leipzig, however, responded straight away and pressed Mainz on the back foot to restore their two-goal lead three minutes later as Haidara made no mistake to tap home Forsberg's square pass.
"We gave up our own advantage in tactics, only to let Jiangsu play its way comfortably," said Shanghai head coach Wang Zhiteng.
Wuhan once had a good chance to pull one back in the 43rd minute when midfielder Liu Yun sent an accurate cross in the penalty area, but forward Dong Xuesheng failed to touch the ball.
Without Kun Aguero, Aymeric Laporte and Ilkay Gundogan, who has been diagnosed with the coronavirus, Pep Guardiola handed a debut to recent arrival Nathan Ake, and young phenom Phil Foden was also in the starting 11.
Both sides had chances in the first half, but all shooting attempts were of low quality. Wang Shenchao was fouled in the penalty area in 42nd minute, but the Shanghai defender was offside beforehand.
But he has fallen out of favor under Atletico's current manager Jorge Sampaoli and has not played for the club since March.