By Gabriel Tan in Bangkok
The Azkals bounced back from last Saturday's 2-1 defeat to Thailand in impressive fashion as they saw off Vietnam courtesy of substitute Emelio Caligdong's 85th-minute winner, and will definitely progress to the semi-finals if they beat Myanmar on Friday.
But despite labelling Tuesday's clash as a must-win encounter ahead of the game, Weiss revealed he would have accepted a draw but credited his players for their never-say-die attitude.
"Honestly if you saw the course of the match, I would have been okay even with a draw," he told ESPNSTAR.com.
"Even that would have opened up possibilities [for us to qualify] but of course now, we are in a comparatively comfortable position.
"There's no need for speculation now - if we beat Myanmar we go through.
"I must pay a big compliment to my team, who gave a fantastic fight in a performance based on strong tactical strategy which they went 100% through with.
"I'm very proud of my team. They fought like lions and warriors to withstand the powerful attacks of Vietnam."
Following a disappointing display against Thailand in their opening game, Weiss made two changes by replacing Caligdong and Angel Guirado with Jason de Jong and Patrick Reichelt in his starting XI, only for the former two to come off the bench and combine for Philippines' winner.
While the German tactician admitted the duo, along with fellow substitute Denis Wolf, had changed the complex of the game, he believed his defenders were equally crucial in getting the three points.
"We had to play an excessive defensive style with counterattacks, which got into full swing after the changes we made," Weiss explained.
"Caligdong, Guirado, Wolf - you can say they changed the game, but all that would not have been possible without our fantastic defence.
"We're back in the race now and are playing against a strong Myanmar side next, and hopefully we succeed in making the semi-finals."
The Azkals boss was also quick to refute suggestions his side would find it easy against a Myanmar side who were hammered 4-0 by Thailand later on in the night.
"Nobody can say Myanmar are the weakest team [in the group]," Weiss added.
"Against Vietnam, they played strongly and they hammered us 5-0 in an Under-23 match.
"It would be naive to think that we are already through and I will not allow that."
Vietnam coach Phan Thanh Hung was visibly distraught by the defeat and was at a loss to explain their sluggish start.
"Today [Tuesday] was the worst match since I took over of Vietnam," he said.
"In the beginning of the match, many players appeared to have psychological problems. They didn't perform good actions with the ball and we deserved to lose the game.
"We had good preparations in terms of mentality before the game but when it started, so many players froze. We made many wrong passes and even the goal we conceded came from a misplaced pass."
The Red Warriors' impressive form in the build-up to the tournament led many to tip them as genuine title contenders, but Thanh Hung admits his players have failed to live up to expectations so far, although he takes fulll responsibility for their abject displays.
"We have some young players in the side and they played very well before the tournament started," he added.
"They showed good performances in previous matches but I don't know why they cannot show their real quality now.
"Before every game, we have plans for each opponent and in this match, our players followed the instructions and tactics.
"I think our players tried their best and I will be responsible for losing this game."
Vietnam will need to beat Thailand in their final game on Friday to have any chance of making the last four.
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