The Taoiseach said if a barrister appointed to look at claims of Garda misconduct recommends a commission of investigation, there will be one.
Enda Kenny confirmed in the Dáil that Senior Counsel Seán Guerin has been appointed by the Cabinet to examine a dossier of documents handed to him last week by the Fianna Fáil leader.
The claims, from whistleblower Sergeant Maurice McCabe, allege Gardaí did not properly investigate a number of serious crimes, including murder.
"Mr Guerin SC, who is an experienced criminal lawyer will assess the investigative methods that were carried out on the papers that are available to him," the Taoiseach said in the Dáíl.
"I expect that everybody will cooperate with this… the gardaí, the DPP where relevant, the GSOC and the confidential recipient – plus the Department of Justice."
It was also announced that there will be statements in the Dáil all day tomorrow on the issues surrounding the whistleblower and garda ombudsman controversies.
The Irish Council for Civil Liberties, however, criticised the Government's proposals to appoint the barrister.
The human rights watchdog said nothing short of an independent statutory inquiry will do.
The ICCL said the "drip-fed" allegations continue to undermine public confidence in the systems of Garda accountability.
Following the Taoiseach's announcement, the Garda Commissioner issued a statement saying "An Garda Síochána looks forward to fully co-operating with the senior counsel."