The top two sides in each of these groups will then advance to the semi-final stage.
Ten teams have been split over two groups, with the top two sides in each group advancing to the semi-final stage.
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Palestine, Uzbekistan and Saudi Arabia all proved to be too strong as Singapore conceded a disappointing 12 goals in three games - and they had to settle for fourth place in Group D as a result with a mere seven points from eight games.
Tatsuma Yoshida's men started off on a positive note when they drew 1-1 with Afghanistan in a friendly back in May, but they were unable to build on that when their World Cup qualification resumed in June.
Singapore didn't deal as well with the Covid-19 enforced break from football as some of their rivals and 2021 has been a year to forget so far.
Tatsuma Yoshida's men started off on a positive note when they drew 1-1 with Afghanistan in a friendly back in May, but they were unable to build on that when their World Cup qualification resumed in June.
The venue for Group B will be the Bishan stadium with a 6,200-odd seating capacity.