Karuanidhi, however, insisted that none will replace the former Union minister as DMK's Organising Secretary (South), a key post.
"No" was Karunanidhi's response to reporters when asked if Alagiri's suspension, ordered in the backdrop of his comments against a possible DMK-DMDK alliance, would affect DMK and its poll prospects in particular.
The 90 year-old leader also rejected reports that the suspension would affect DMK's poll prospects, saying it was a media creation.
Asked if Alagiri will be replaced as DMK's Organising Secretary (South), Karunanidhi said, "that post was created for him and no one else will be appointed."
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Replying to a question whether Alagiri's suspension will be revoked if he apologised, Karunanidhi said it was up to his son to do so and that he should be asked about the apology.
Reacting to the disciplinary action, Alagiri told a Tamil TV channel that "suspension is the prize that I have got for questioning the removal of my supporters."
Asked if his suspension would affect the party, Alagiri said it would be known "only in the due course."
On Dravidar Kazhagam (DK) leader K Veeramani welcoming his suspension, Alagiri slammed him saying "only he is responsible for the decline of the DMK, he is a political trader."
Meanwhile, DMK Treasurer M K Stalin and Alagiri's brother denied any rift with his elder sibling and described his suspension as a party affair.
On many occasions, disciplinary action had been taken against erring functionaries but that had not affected the party and it should not do so, he added.
There were no problems between the brothers, he claimed.