Singapore's currency may tumble to the lowest level since 2017 if the central bank responds as strongly to the spread of the coronavirus as it did to the severe acute respiratory syndrome (Sars) epidemic two decades ago.

That is the view of Mr Tan Teck Leng, a macro strategist at UBS Group's Global Wealth Management Chief Investment Office, who thinks the Monetary Authority of Singapore (MAS) could re-centre its policy band for the currency lower.