The club insisted that their measures and protocols around COVID-19 remain stringent. They even offered to test the Hull City team ahead of Tuesday's fixture, but the visitors declined the offer.
The result at Arena do Gremio in the southern city of Porto Alegre left Gremio 12th in the 20-team standings with 13 points from 10 matches. Palmeiras rose two places to fourth with 18 points.
Dalian Pro and Guangzhou R&F are tied with 11 points, ranking sixth and seventh respectively with three games left in the Suzhou division before the match. Both sides need a victory to keep their hope alive of finishing among the top four.
Brighton meanwhile impressed with a 3-0 thrashing of Newcastle United and the game is already looking like a watershed moment for Ole Gunnar Solskjaer, who needs a quick reaction in order to calm jittery Old Trafford nerves.
The striker Mehdi Ghaedi and the midfielder Ali Karimi gave a 2-0 lead for the Iranian side in the first half. Cheick Diabate scored the third goal with a header in the 54th minute.
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.
The Celta captain opened the scoring after receiving a pass from Nolito after 15 minutes in an entertaining match which saw Celta play some impressive football.
He said that those events have shown that "we can organize safe sports events even without a vaccine."
Both the Mexican and Costa Rican national teams have yet to play this year because of the global health crisis. Enditem
New signing Donny van de Beek gave United a chance with a goal in his debut but Zaha's excellent second strike five minutes from time condemned them to defeat.
The 16-team CSL was split into two groups, each group of eight teams based respectively in Dalian and Suzhou. Both groups will play 14 rounds in the first phase, which is to end next Monday.