Workers at one of Singapore's major container terminals are to be tested for Covid-19 after the facility became the site for the city-state's latest virus cluster.

The Covid-19 cluster involved four port workers that were working at PSA International’s Pasir Panjang Terminal, according to Singapore's Ministry of Health (MOH).

A PSA spokesman said the company had "stepped up measures to prevent the further spread of virus" while minimising disruptions to port operations.