The rise of robots in manufacturing in Southeast Asia is likely to fuel modern-day slavery as workers who end up unemployed due to automation face abuses competing for a shrinking pool of low-paid jobs in a "race to the bottom," analysts said Thursday.

Drastic job losses due to the growth of automation in the region — a hub for many manufacturing sectors from garments to vehicles — could produce a spike in labor abuses and slavery in global supply chains, said risk consultancy Verisk Maplecroft.

More than half of the workers in Cambodia, Indonesia, Thailand, Vietnam and the Philippines — at least 137 million people — risk losing their jobs to automation in the next two decades, the United Nations' International Labour Organization says.