"My support will be only till the next elections," Hazare said in a statement issued from his native place, Ralegan Siddhi in Maharashtra's Ahmednagar district.
"Mamata Banerjee has fought for the society and has faced physical assaults in national interest and I feel such people should lead the country.
"That is the reason I have extended my support to Banerjee. However, this support will be only till the coming polls," he said.
"I have not supported Mamata Banerjee the person or the party but I liked her social and national perspective," he said.
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"I support the spirit of sacrifice that I see in Mamata Banerjee.
"She is the only leader who responded to my letter seeking support on 17 issues for good governance," he noted.
"I had sent the letter to (AAP leader and Hazare's former lieutenant) Arvind Kejriwal too and told him that I am willing to support you just as I supported Mamata but he hasn't replied," Hazare said.