Bogor. Indonesia must defeat Singapore in its final Group A match to keep its ASEAN Championship (AFF Cup) semifinal hopes alive after suffering a 3-0 home defeat to Vietnam on Monday.

The loss dropped Indonesia to third place in the group with six points, while Vietnam moved to the top of the standings with seven points, ahead of second-placed Singapore on goal difference.

Singapore, which also has seven points, needs only a draw against Indonesia when the teams meet on Aug. 7 to secure a place in the semifinals.

Vietnam took control early at Pakansari Stadium in Bogor, with Nguyen Van Vi opening the scoring in the sixth minute before Nguyen Hai Long doubled the lead with a swift counterattack nine minutes later.

Indonesia struggled to break down Vietnam's disciplined defense despite the presence of naturalized players Thom Haye and Mitchell Baker, while goalkeeper Patrik Le Giang produced several key saves to preserve the visitors' advantage.

Vietnam sealed the victory in the 70th minute when Nguyen Xuan Son finished a counterattacking move after receiving a through ball from Nguyen Hoang Duc.

"We as players take full responsibility for this defeat," Indonesia goalkeeper Nadeo Argawinata said after the match.

"Honestly, we didn't play well today and lost control of the game. Our focus now is on the next match, and we'll do everything we can to perform better."

Indonesia: Nadeo Argawinata (GK); Shayne Pattynama, Rizky Ridho, Jordi Amat, Eliano Reijnders, Dony Tri Pamungkas (Tim Geypens 65'), Marc Klok (Beckham Putra 65'), Ivar Jenner (Rayhan Hannan 90+2), Thom Haye, Ragnar Oratmangoen (Jens Raven 65'), Mitchell Baker (Rizky Eka 82').

Coach: John Herdman.

Vietnam: Patrik Le Giang (GK); Nguyen Hoang Duc (Nguyen Quang Hai), Nguyen Van Vi, Pham Xuan Manh, Le Pham Thanh Long (Nguyen Xuan Son 63'), Nguyen Tai Loc, Truong Tien Anh, Nguyen Thanh Chung, Nguyen Hai Long (Do Hoang Hen 63'), Bui Hoang Viet Anh (Doan Van Hau 81'), Nguyen Dinh Bac.

Coach: Kim Sang-sik.