Doctors of the Vietnamese Olympic team said it would take Toan at least three weeks to recover from an ankle injury, a time frame that puts him back on the field after the ASIAD come to a close.
Toan scored Vietnam's first goal in the first Group H match against Iran on September 15. Vietnam built off Toan's goal to beat Iran by 4-1. He left the pitch in the first half after an Iranian defender clashed with him by error.
Vietnam will play Kyrgyzstan for the second match on September 22.