The national Under-19 team were thrashed 7-0 by Thailand in the Asian Football Confederation (AFC) Under-19 Championship qualifier yesterday.
Thailand didn't waste any time, taking the lead in the 10th minute through Tanadol Jansawang.
They would go on to score two more goals - Sariya Marom (31st) and Kullachat Jeentanorm (45th) - to go into the break with a comfortable 3-0 lead.
Kullachat would go on to score a hat-trick, finding the back of the net in the 68th and 90th minute.
The remaining two goals were scored by Phitiwat Sookjitthammakul (54th) and Jangsawang (90th) at the Thai Japanese Stadium in Bangkok, Thailand.
Brunei have now lost all two games and sit at the bottom of Group H after falling 6-0 to North Korea in their opening game on Tuesday.
North Korea, meanwhile, defeated Singapore 4-0 in yesterday's later game.
Their goals came from So Jong Hyok (14th), Kim Yu Song (24th, 31st) and Kang Nam Gwon (29th).
Thailand now top the table with six points with 10 goals and a clean sheet.
North Korea sit in second despite sharing the same statistics as Thailand.
Singapore is in third on similar points with Brunei but they boast a superior goal difference.
North Korea and Thailand will battle it out on Saturday to see who will top the group.
Following their game, Brunei will face Singapore in the final game for Group H.