Fianna Fáil whip Seán Ó Fearghail is to meet former deputy leader Éamon Ó Cuív to discuss his continued membership of the parliamentary party.
Mr Ó Cuív said yesterday that he would campaign for a No vote in the referendum on the fiscal treaty.
He indicated that he "couldn't do otherwise" because of the stance he had already taken on the treaty.
It is understood the party leadership wants to establish what role Mr Ó Cuív intends to play in the No campaign.
Fianna Fáil leader Micheal Martin has refused to say whether Mr Ó Cuív will face disciplinary action if he continues to campaign for a No vote.
Mr Martin said the party's position was known and Mr Ó Cuív's position was well-known.
He said as far as he was concerned the treaty was the core issue and he was not going to be sidetracked by any other issue.
Speaking on RTÉ's Drivetime this evening, finance spokesman Michael McGrath said the Chief Whip would report back to the leadership on his discussions with Mr Ó Cuív.