COVID-19 cases around the world, we will be putting in place more stringent measures for travellers to manage the risk of importation."The ministry also announced that all Singaporeans and permanent residents returning from the United Kingdom and South Africa will be subject to an additional seven days of self-isolation at their place of residence, following their 14-day stay-home notice period at dedicated facilities.This takes effect from 11.59 pm on January 18.They will be tested at the end of their stay-home notice, as with the current requirement, and again after they complete their seven-day self-isolation period, said the MOH.Singapore authorities had earlier restricted entry and transit for all long-term pass holders and short-term.