The Serb said he did not play his best tennis this time in Rome, but could find it when needed.
"We gave up our own advantage in tactics, only to let Jiangsu play its way comfortably," said Shanghai head coach Wang Zhiteng.
With the result, Hertha Berlin suffered its first defeat whereas Eintracht Frankfurt took its first win of the season.
Madrid is likely to control most of the game, but Zidane needs wide forwards Rodrygo and Vinicius Jr to turn control into goals.
Meanwhile, Benjamin Garre and Tiago Banega scored in the last five minutes of regular time to hand Argentina's Racing Club a 2-0 win at Alianza Lima.
In the 11th minute, the Spanish team were awarded a penalty after David Alaba felled Ivan Rakitic, allowing Lucas Ocampos to open the scoring in the 13th minute.
Li then overwhelmed Jiangsu with four kills. Wang Yuanyuan made the set points for Tianjin to level it at 1-1.
"We know it is very important, but we think it will not affect the competitions of the Olympic Games," he said.
The second half started similar to the first as Leverkusen were the more active team whereas the "Wolves" lurked for their chances.
The Barcelona-based sports press report than Barca are closing in on a deal to sign Ajax's 19-year defender Sergino Dest and are also interested in Norwich City's Max Adams as replacements.
The only down side for the capital-based team was that Renato Augusto limped off with injury as the Brazilian was suspected of suffering a muscular problem.