Palaniswami is also Chief Minister of Tamil Nadu while Panneerselvam is his deputy.
Prabhu had on February 23 called on Dhinakaran at his residence here and said he had joined the latter's camp out of his own volition.
He had then said that Dhinakaran and his aunt and deposed AIADMK leader V K Sasikala only had the capability to steer the party.
Sasikala is currently serving a prison term at Parappana Agrahara Central Prison in Bengaluru after being convicted in a disproportionate assets case.
In a separate statement, Panneerselvam and Palaniswami announced the expulsion of three functionaries from AIADMK's Villupuram (South) unit for allegedly bring disrepute to the party.