By Gabriel Tan
The Azkals are currently 90 minutes away from their first-ever final appearance in Southeast Asia's premier international tournament, and their last-four tie with the Lions remains evenly poised after Saturday's 0-0 first-leg draw in Manila.
Despite failing to record a win on home soil, Philippines showed good spirit to come back strongly after the break after being dominated in the first half, and Weiss believes more of that will be needed at the Jalan Besar Stadium on Wednesday.
"We will need to same spirit shown in Manila," he said at Tuesday's pre-match press conference.
"We have worked a lot on that and we now have a very competitive group.
"We have shown it's difficult for our opponents to break us down and we want to continue to be a defensively-sound unit.
"Singapore will have a small advantage because of their experience, but the boys are hungry and eager to show that they can do."
While expectations from the Filipino public are at an all-time high given the huge strides the Azkals have taken in recent years, the German believes it would not completely be a disaster if they are to fall at the semi-final hurdle, as they did two years ago against Indonesia.
"The Suzuki Cup is an exciting and interesting tournament," he added." But we have to be realistic.
"We are still developing and emerging in football, and teams like Singapore, Malaysia and Thailand are still ahead of us.
"I want to focus on our progress and we have to keep our efforts high. Reaching the semi-finals is already a success but we have to keep moving forward."
While Weiss is likely to bulk of the eleven that started against the Lions at the Rizal Memorial Stadium last weekend, one probable introduction will come in the form of Jerry Lucena, who looks set to take his place in the lineup at the expense of Jason de Jong.
Despite Lucena flying straight to Singapore from Denmark after being released by club side Esbjerg, his coach was hopeful he would be able to shrug of the effects of a long flight, which was said to have affected left-back Dennis Cagara in the first leg, and play a key role for Philippines.
"Lucena is suffering from a bit of jetlag and we saw how that played a part with Cagara on Saturday, although he will have one extra day to recover," Weiss revealed.
"He has tremendous experience and the ability to hold on to possession and get out if situations better than most.
"He's one of the most experienced players in the Danish Superliga and is a very important character in the team."
Apart from a five-year spell with AGF, which ended in June this year, Lucena has spent his entire career playing with Esbjerg.