Hari Singh Saini announced his decision here at his residence in the presence of INLD MLA Abhey Singh Chautala.
Saini had left the Congress recently to protest its leaders alleged indifference towards partymen.
Addressing mediapersons, he expressed his faith in INLD led by Om Prakash Chautala and said that his party alone could safeguard the interest of Haryana on all issues.