Ratings agency Moody's warned South Africa again on Tuesday that growing government debt linked to bailouts of state firms would continue to pressure the country's investment grade status.
Moody's was the last of the big three ratings agencies to give South Africa an investment-grade rating, so markets are sensitive to any pronouncement it makes on the fiscal and economic strength of Africa's most industrialised economy.
"The credit profile would face downward pressure if Moody's expects that government debt and contingent liabilities risk from State-owned enterprises will continue to rise to levels no longer consistent with a Baa3," said Moody's senior credit officer Lucie Villa in a research report.
Moody's last month postponed a review of South Africa's creditworthiness, a reprieve that boosted the rand and local bonds.
In the research report, Moody's said that while South Africa's public debt was similar to other countries ranked at the same level, the upward trajectory, along with weak economic growth, was worrying.
In February, South Africa's National Treasury granted power utility Eskom a R69-billion bailout over the next three years to help it service its R420-billion debt.
But the firm said this month it needed more cash to survive and avoid implementing countrywide blackouts it unleashed in February and March that are expected to have dampened first-quarter growth.
The rand hardly moved following the research report, trading steady at 14.0800 at 1015 GMT.
Peter Attard Montalto, head of capital markets research at Intellidex, said: "Today's report and its contradictory statements will do nothing to assuage increasing disquiet amongst investors about Moody's rating of South Africa."