Senior Congress leader from Maharashtra Narayan Rane resigned from the party on Thursday.
He announced the decision a short while back in Sindhudurg in Maharashtra.
The lawmaker from the Kudal constituency has reportedly been negotiating to join the Bharatiya Janata Party (BJP) in the coming days.
Rane, who quit the Shiv Sena in 2005 following the emergence of Uddhav Thackeray as the political heir of Sena founder late Bal Thackeray, was unhappy with the Congress leadership.
He had accused the Congress leadership of not fulfilling the promise of making him the chief minister.
Rane began his political career as a shakha pramukh (local ward chief) in the Shiv Sena, and was the chief minister of the Shiv Sena-BJP government in 1999.
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