Both teams came into the tie having confirmed their places in the knockout stage and it was the visitors who threatened first with Rafaelson pulling his shot just wide of the left post.

Bangkok United tried to find their rhythm but Muhsen Al Ghassani’s threatening run was flagged offside, while Nam Dinh went close again in the 11th minute with Nguyen Van Toan shot just missing the target.

The home side finally kicked into gear in the 16th minute with Al Ghassani and Thitiphan Puangjan threatening from outside the box before Luka Adzic almost put Bangkok United ahead seven minutes later when he angled his header over the bar.

Joseph Mpande had a golden opportunity to give Nam Dinh the lead in the 24th minute when he collected Tran Van Dat’s cutback from inside the box, only to be denied by Bangkok United keeper Patiwat Khammai.

The goal finally arrived for Nam Dinh in the 29th minute when Tran Van Dat floated in a perfect cross for Rafaelson to nod home into the bottom right corner.

The home side responded in the 35th minute with Al Ghassani setting up Adzic at the top of the box for the Serbian to finish with a curling effort.

Bangkok United then took the lead in stoppage time with Al Ghassani converting from the penalty spot after Walber brought down Bassel Jradi inside the area.

The Vietnamese side almost drew level in the 66th minute after Nguyen Tuan Anh sent an inviting cross for Rafaelson, whose powerful header was saved by Khammai.

However, Bangkok United struck their third in the 83rd minute with Jradi finishing off Mahmoud Eid’s layoff following a fine counter-attack into the bottom right corner with Nam Dinh narrowing the deficit through Rafaelson’s penalty in the 89th minute.