Smith has become the brand ambassador for Washington Freedom, a team that collaborates closely with his home state team, New South Wales in Australia.
Smith expressed excitement at the thought of taking cricket to the United States and could possibly finish his career there.
Australia does not have any fixtures during MLC's July window next year, meaning Smith could play in MLC while also continuing for Australia as an all-format international.
Key figures in the NSW team, including captain Moises Henriques, are set to appear for Freedom in MLC's inaugural season.