"The risk premium has gone up after the recent political crisis and the borrowing cost is expensive after the rating cuts. This loan will be used to repay some loan repayment in the first quarter," one source said.
As of the end of 2018, nearly a quarter of Sri Lanka's total foreign debt was owed to China, which has lent some $8 billion while building ports, highways and planning other major investments in the South Asian island state.
There was no immediate comment from Sri Lanka's finance ministry, which is on holiday for a local festival, and calls to the Bank of China in Colombo were also unanswered.