"Sidhu has no ideology. He left himself in the market for making deals. He was bargaining with both Congress and AAP," Mr Badal said at an event in New Delhi.
He added that Mr Sidhu joining Congress will have "no impact" on the state assembly elections next year. In the past, Mr Sidhu, notwithstanding BJP's alliance with SAD, had criticised Sukhbir Badal on many occasions.
Speculations of Mr Sidhu's joining Congress have become more loud after his wife - Navjot Kaur Sidhu - joined the party last month along with Olympian Pargat Singh.