An investigation into the possible leaking of information about Barry Cowen's drink-driving ban is being referred to the Garda Síochána Ombudsman Commission (GSOC).
Gardaí earlier launched a preliminary investigation, but this is now being referred to GSOC on the back of a complaint by Mr Cowen.
Last week, the Agriculture Minister apologised in the Dáil for the 2016 incident which he described as a "stupid, stupid mistake."
In an earlier statement, An Garda Síochána said it was conducting "a preliminary examination to ascertain if an investigation should be conducted into whether a third party had access to personal data held by the organisation in relation to an individual."
In a statement today, Minister Cowen said: "The Sunday Times has today published an article referring to an incorrect Garda record dealing with the incident which occurred on 18th September 2016 despite the fact that my solicitors wrote to the newspaper in advance of publication.
"On being informed of its existence I sought a copy of this incorrect record and am taking steps under the Data Protection Act to have it corrected.
"This incorrect Garda record can only have come into the possession of the newspaper through a criminal act.
"It is a criminal offence for a member of An Garda Síochána to disclose any information obtained in the course of his or her duties.
"I am informed that An Garda Síochána has commenced a criminal investigation into the source of this leak."
Following this, GSOC said: "As Minister Cowen's statement constitutes a complaint against a member or members of An Garda Síochána the Commissioner will be referring the matter to GSOC for its consideration."
