"Vasant Sathe, eminent Congress party senior leader and one with whom we shared a comfortable and able relationship, passes away. Surprising ... since just two days ago he was (on) TV in a debate !" Big B posted on his blog Bigb.bigadda.com.
Sathe, 86, died following a heart attack at his Gurgaon residence Friday.
"He was the most affable individual and during the time when I was an elected member of parliament, would be of great encouragement to me. Prayers for his soul, " Bachchan said.
The superstar entered politics in 1984, contesting the Lok Sabha election from Allahabad on a Congress ticket.