Tan sealed the win for Changchun with a drive in the 81st minute.
Hoffenheim defended deep in the hope of protecting their narrow lead to the final whistle, but it didn't work out as Cologne substitute Dominick Drexler tapped home a rebound from close range to restore parity in the 88th minute.
Several government officials have underlined that the permission depends on the outcome of the project. In case of violations, a new ban could be the result.
This week saw Koeman's men beat Girona 3-1 in another preparation game, but Saturday will be their last chance to get things right before things are for real next week.
The 37-year-old was among 26 players summoned by head coach Gerardo Martino for the Tricolor's first fixtures of the year, which will be preceded by a five day training camp starting Saturday.
But the partnership broke down as they failed to reach an agreement on controversies said to be mainly caused by the COVID-19 pandemic, PP Sports said.
"I'm really happy that it finally worked out," said Liverpool manager Jurgen Klopp. "I'm really happy to bring this wonderful person in as an add-on to the squad." Enditem
The 2018 French Open winner will meet Karolina Pliskova, the second seed, who beat fellow Czech Marketa Vondrousova 6-2, 6-4 in the other semifinal. Enditem
Elhami was banned from coaching activities by the Disciplinary Committee of the Iranian Football Federation.
On Friday, Persepolis beat Al-Taawoun 1-0 in Group C of the 2020 AFC Champions League thanks to Resan's penalty.
"The situation was complicated so it was important to win tonight. It's hard, we created some chances, but we're not 100%."