By Gabriel Tan
The Azkals, who booked their place in the last four for the second tournament running by finishing as runners-up in Group A, looked to be in a good position to make the final after holding Singapore to a 0-0 draw in last Saturday's first leg in Manila.
However, they were unable to find a way past a resilient Lions outfit at the Jalan Besar Stadium on Wednesday evening and ultimately fell to Khairul Amri's 19th-minute strike, but Weiss insists his side have to quickly move on and look to the future.
"I congratulate my team for their efforts in the whole tournament and today [Wednesday]," he said.
"But we don't have much time to mourn because we are already in the middle of preparing for the AFC Challenge Cup .
"It is a tournament for emerging nations in Asia and our goal is to get first place [in the qualifiers] on home soil in order to succeed in 2014 and win the tournament.
"From there, we can look at going on to the AFC Asian Cup in 2015."
Although the German was slightly unhappy with Singapore's aggressive play on Wednesday, he graciously insisted that they deserved to progress to the final.
"Today [Wednesday] we saw that Singapore were, I don't want to say brutal, but very aggressive," Weiss added. "Especially on our number ten Phil Younghusband.
"No yellow cards were given for fouls, obvious fouls weren't called but we don't want to blame the referee. If a yellow card had been given early on, maybe that would have played into our cards.
"Their goal was a gift and in the last ten days we've been talking about set-pieces, then we give away such a simple set-piece. It was a very nice shot though, but it shoudn't have happened.
"We were talking at halftime that it wasn't a foul but it's not the referee who is to blame for the defeat today [Wednesday].
"I want to congratulate Singapore and I wish them good luck in the final. They had that extra portion of experience and coolness and deserved luck, and all their preparation makes them deserved winners.
"They had that extra bit of caution and coolness and we didn't produce too many chances, we have to be honest. Overall, I would say it [Singapore's win] was deserved."
Weiss is now the second coach to have led the Azkals to the semi-finals of Southeast Asia's premier international tournament, after Simon McMenemy achieved that feat in 2010.