Adani has urgently pumped more than $100 million into a crucial Australian subsidiary after the coronavirus derailed debt refinancing efforts, triggering ratings downgrades and steep falls in the value of the company's bonds.

Australian-registered company Adani Abbot Point Terminal (AAPT) has signalled to lenders it will repay by Friday the $100 million of debt that is due for repayment next month, after an 11th-hour funding injection from a related party.