Brazilian news outlet O Globo said former Atletico Madrid duo Diego Ribas and Filipe Luis were among the players to test positive. Others were Chile international right-back Mauricio Isla, winger Bruno Henrique, forward Michael Delgado and defender Matheuzinho, the report added.
The five-man leading pack started to wither after 27km. Duo was the first to fade away and Dong dropped back after 33km. Su and Yang Le broke away from Peng after 35km and the in-form Su managed to pull clear from Yang near 39km.
The organizing committee of the competition said in a statement that a decision was made after consulting the UCI and related experts and has been approved by the local government.
Cadiz looked disciplined after the opening goal from the veteran striker, while Huesca struggled to create clear chances throughout the game.
In Tuesday's statement, Fedefutbol asked its government to "start conversations" to facilitate international fixtures scheduled for October and November.
That has raised doubts over whether Zidane is going to face the same issues as last season, when his side at times struggled to score goals.
The Short Track Speed Skating World Cup, to be held in December, will be the first test event for Beijing 2022. Enditem
The second half saw David Silva make his home debut, coming on for Isak shortly after the hour, while Casemiro, Fede Valverde and youngster Marvin Park, making his Madrid debut, came on for Zidane's side with 20 minutes left to play.
The match featured several Chinese national team players, including Jiangsu's Zhang Changning and Tianjin's Li Yingying.
But these are just one-quarter of over 200 simplification measures to be talked about and more challenges are lying ahead of the IOC and Olympics organizers.
The substitutions made an impact on Hertha's performance, as the hosts increased the pressure and were able to pin Frankfurt in their territory. However, they lacked the penetration and ideas to overcome Frankfurt's well-positioned defense.