Vietnam will face Singapore, Myanmar and hosts Hong Kong in an U18 tournament later this month.
U18 players under training in Hanoi
Teams will play in a round robin format to determine the overall champions.
The Vietnamese players under coach Hoang Anh Tuan are training in Hanoi.
They have 10 days to prepare before departing for Hong Kong on April 17.
Vietnam will first play Singapore on April 19, Myanmar the day later and the hosts on April 22.
The Hong Kong event is one of their warm-up activities for the 2019 AFF U18 Championship and the 2020 AFC U19 Championship qualifiers later this year.