Police are continuing to review CCTV footage to establish Mr Singh's movements.
They say his disappearance is out of character and they are not considering foul play at this stage.
Mr Singh's boss and owner of Café Melba in Vulcan lane, Shawn Pope, said contrary to earlier reports that the student was rostered to work on Sunday, he wasn't actually due in for a shift till later this week.
He said the first they heard of his disappearance was through the authorities and the media.
While he didn't want to comment too much on the disappearance, everyone at the cafe was worried and they were all hoping for his safe return.