Forward Serginho restored Jorge Wilstermann's advantage with a 56th-minute strike but Alves pulled his team level again with a smart finish after combining with Fabio Luciano.
"To have kept the team together might turn into our big advantage," Borussia's managing director Max Eberl said.
The Spanish press also report on Wednesday that Real Madrid and Tottenham are also talking about a loan deal to see Gareth Bale go back to White Hart Lane, seven years after leaving the club to join Real Madrid.
"Our players are highly motivated to beat their opponents on Sunday. We are Esteghlal and can benefit from our previous experience in the competition," he added.
DOHA, Sept. 15 (Xinhua) -- Al-Ahli Saudi FC of Saudi Arabia became the first team to reach the 2020 AFC Champions League round of 16, with a late Marko Marin goal earning them a 1-0 win over Iraq's Al-Shorta in Group A on Monday.
The single-leg match was played behind closed doors at Sammy Ofer Stadium in the northern city of Haifa.
Mo Youxue of Guangdong competes during the men's 4X100m relay final on Day 2 of the 2020 Chinese National Athletics Championships in Shaoxing, east China's Zhejiang Province, Sept. 16, 2020. (Xinhua/Jia Yuchen)
The visitors doubled their lead shortly after the start of the second half, when the impressive Gabriel rose highest to head home Willian's corner.
Feng Bin of Shandong competes during the Women's Discus Throw Final on Day 4 of the 2020 Chinese National Athletics Championships in Shaoxing, east China's Zhejiang Province, Sept. 18, 2020. (Xinhua/Wang Lili)
Eight minutes later, things went from bad to worse for Duisburg as Volkmer felled Erling Haaland as the last man to receive his marching orders.
The 35-year-old did not travel with his teammates to the Andean country on Monday after failing to recover from a shoulder injury, Flamengo said on Twitter.