Vietnam announced the 23-member squad for the tournament on February 14 evening. Hong Linh Ha Tinh football club contributes most players with six, followed by Hoang Anh Gia Lai club with five.
The teams are divided into two groups and are playing in the round-robin format. Two best teams of each group will advance to the semi-finals. All the matches take place at the Phnom Penh National Olympic Stadium.
Vietnam will continue to face Timor Leste on February 19 and Thailand two days later.
Group B includes Malaysia, Indonesia, Myanmar and Cambodia.
Speaking to reporters, Vietnamese head coach Nguyen Quoc Tuan said his team would reach the final.
All the 16 matches of the 2019 AFF U22 Championship will be aired on VTV5 and VTV6.