Weightlifter Tran Le Quoc Toan finished second in the men's 56kg category at the Asian Olympic Qualifiers in South Korea on Tuesday.
Many believe he is likely to secure an Olympic berth.
Toan lifted a total 279kg (126kg in the snatch and 153kg in the clean and jerk).
Gold medalist Li Fabin, from China, cleared the same weight.
After learning the results, Nguyen Hong Minh, former Director of the High Achievements of Sports Department, said Toan is 99% certain to win an Olympic berth.
"Vietnam registered for the team category, so we must wait," Minh said. "One advantage is that countries with strong lifters like China, South Korea and Indonesia have secured enough places, so Vietnam is likely to win a berth."