He was responding to a question raised in Parliament by Janatha Vimukthi Peramuna (JVP) member Vijitha Herath.
Wickremesinghe said there is no need to have a special military unit in the country.
The Prime Minister said that cabinet had last week discussed the matter of addressing the garbage issue and not about Fonseka.
Cabinet spokesman Dr. Rajitha Senaratne said last week that Field Marshal Sarath Fonseka is to take on a new role on a request made by President Maithripala Sirisena.
He said the new role includes working with the military in the event of a strike by employees of essential services.
However the Prime Minister said there was no such decision taken by the cabinet. (Colombo Gazette)