State minister K Pandiarajan, known to be a Sasikala supporter, on Saturday joined Panneerselvam's camp.
She urged party members not to have any truck with Madhusudanan.
Expressing her readiness to "face any probe" over the death of J Jayalalithaa, AIADMK General Secretary V K Sasikala said that she hopes the Tamil Nadu Governor would "uphold the Constitution" and invite her to take oath as Chief Minister.
Panneerselvam camp now has seven MLAs, including him. According to reports by India Today, 50 MLAs signed the statement pleading their support for "Chinnamma", while 44 declined. Several AIADMK leaders, including Panneerselvam, have said they were not allowed to visit Jayalalithaa during her 75-day stay at the local Apollo hospitals. In 1983, when Jayalalitha addressed her first public meeting as AIADMK propaganda secretary in Cuddalore, the then district collector V. Chandralekha introduced Sasikala to her. With her threatening with another kind of protest, it is clear she will not submit easily and the coming days will see some cracking political contest between the warring factions.
A candidate for the post should also have completed at least five years in the party and Sasikala had joined on March 31, 2012, so she does not qualify, he added. Ms Sasikala is named in a case that alleges she has assets disproportionate to her income.
Subsequently, Sasikala left for Golden Bay resort at Kuvathur near Mamallapuram to meet MLAs who have allegedly been "detained" there. "So he may ask the CM to take opinion of the House (Assembly)", the former Chief Minister of Andhra Pradesh (undivided) said.
Madusudanan told reporters about the letter shortly before he was sacked from AIADMK by Sasikala for acting against the party.
Television channels February 10 night reported that Governor C. Vidyasagar Rao had ruled out AIADMK general secretary V.K. Sasikala for chief minister-ship in a report to the Union Home Ministry, but the Governor's House denied the report, adding to the continuing political uncertainty gripping the state over the past four days.
After the amendment was finally passed, Sasikala was quick to take credit.
She accused Sasikala of favouring those who were "rejected" by late Jayalalithaa. At the party's General Council meeting on 28th December, appropriate resolutions were passed and later handed over to Sasikala. A day later, Shanta Sheela Nair who was Officer on Special Duty to the Chief Minister also resigned. Raj Bhavan sources said it was a courtesy call.