Vasan was shown the door after he targetted the AICC over the way the leadership handled the affairs of the Tamil Nadu unit and allegedly ignored the merit of leaders.
At the AICC briefing, party spokesman Ajoy Kumar said that Vasan has been "expelled" with immediate effect for his "inappropriate" statements.
Congress general secretary Mukul Wasnik told reporters that parting of ways by Vasan could not be considered a split in the Tamil Nadu unit as the "majority" of the leaders and the cadres are with the party.
The Congress general secretary also rejected suggestions that Vasan's parting of ways was reflective of the weakness of the central leadership of the party in the wake of the debacle in the Lok Sabha polls. Congress had scored a duck in Tamil Nadu during the Lok Sabha elections in May.
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"It is a reflection on the individual concerned. When Congress was in power, he remained with the Congress and enjoyed power and when the party lost in the Lok Sabha elections,.....He is leaving," he said.
He accused Vasan of "spreading absolute falsehood" on the issue of allowing photos of Kamraj and G K Moopanar on the membership cards.
Wasnik said the action was taken against Vasan as it has not received any resignation from him.