"I feel that there are a lot of similarities between the two as Modi is trying to follow Hitler in his bid to capture power," he told reporters.
Singh said with Modi coming into the limelight, the BJP has become "tiny" in Gujarat.
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In Gujarat, he said, there was no BJP only Modi and added that the situation was similar in Madhya Pradesh and Chhattisgarh.
The Congress leader said that in Madhya Pradesh there was only Shivraj Singh Chouhan and in Chhattisgarh, there was Raman Singh and no BJP.
He said that one should not be surprised at all on what Modi can do to get power and added that his "dream" of making India Congress-free would never be realised.