International Relations Minister Lindiwe Sisulu has instructed the department to approach diplomatic representatives of five countries following their direct correspondence with the Presidency.
South Africa has taken a dim view after the United States, United Kingdom, the Netherlands, Germany and Switzerland, through their diplomats, wrote directly to President Cyril Ramaphosa warning South Africa to act against corruption.
In recent weeks, damning testimony by former Bosasa executives at the Zondo Commission on State Capture have implicated government officials in corrupt dealings with the company.
Dirco says the move by the five countries is a departure from established diplomatic practice. The Minister of International Relations is expected to comment on this matter after meeting the diplomats on Monday.