Dr Singh on Monday, May 10 rebuked Mr Ramesh for making critical remarks against the Home Ministry in connection while he was in Beijing.
The Prime Minister Office (PMO) sources have revealed that the PM has advised "Cabinet colleagues not to make comments on the functioning of other ministries, especially with regard to relationship with important neighbours like China."
The PM has stressed that there was 'no confusion' over India's stand on China, the sources added.
This comes in response to Ramesh's remarks in Beijing stating that the Home Ministry was 'alarmist' in its approach towards entry of Chinese companies in India.
Earlier, Congress had distanced itself from the issue saying that once the minister return to India he can clarify on his statements.
This is not the first time the Prime Minister had to trim the freedom of speech of his cabinet members. In the wake of the Dantewada Maoist massacre, Dr Singh had issued a gag order restricting the leaders to stop expressing different views and opinions on the brutal attack as well as on Home Ministry.