In a blow to Congress, MLA Rahul Lodhi resigned from the party and joined the ruling Bharatiya Janata Party (BJP) on Sunday, ahead of the November 3 state bypolls. Since March this year, about 26 MLAs have quit the Congress.
He joined the saffron party in the presence of Madhya Pradesh Chief Minister Shivraj Singh Chouhan.
"He gave his resignation on Friday, but I asked him to rethink over it for two days. He called me last night saying he was firm on it and wanted his resignation to be accepted on the auspicious day today," MP Assembly's Protem Speaker Rameshwar Sharma said.
BJP state spokesman Rajnish Agrawal later said Lodhi has joined his party.
Lodhi represented Damoh seat in the state Assembly.
There are speculations that one more Congress MLA may also quit the party.
By-elections to 28 Assembly seats in the state are scheduled on November 3.
Twenty-five of these seats fell vacant after sitting Congress MLAs resigned and joined the BJP, leading to the collapse of the Kamal Nath-led state government.
Most of these rebel Congress MLAs were considered close to Jyotiraditya Scindia, who also walked out of the Congress and joined the BJP.
Besides, three seats fell vacant due to the death of their sitting MLAs.
The BJP at present has 107 MLAs and it needs to win just nine more seats to reach the magic figure of 116 - the simple majority mark in the 230-member house.
The Congress's strength in the House has now been reduced to 87.
(With PTI inputs)