The move to Level 5 restrictions for six weeks was announced by Taoiseach Micheál Martin.
The recommendation comes in the wake of a spike in Covid-19 cases across Ireland in the past week.
The move of the three counties to Level 4 restrictions comes in the wake of a spike of cases in the counties and the rapid rise of cases in bordering Northern Ireland.
Seven high growth, IDA-backed companies have announced the creation of 206 new jobs in Dublin, Kildare, Sligo and Cork.
Ireland’s Chief Medical Officer, Dr Holohan has said he is “deeply concerned” at the rate of spread of Covid-19 since Sunday
Every county in the Republic of Ireland will be moved to Level 3 Covid-19 restrictions from midnight.
The National Public Health Emergency Team has made the recommendation to the Irish government that the entire country should move to Level 5 restrictions.
934 cases is the highest number of cases recorded to date and is twice the amount of the cases recorded on Wednesday (424).
Dr. Holohan had stepped away from his role at the start of July for family reasons but is now expected to make a return to his role on Monday.
Ireland’s Acting Chief Medical Officer, Dr Ronan Glynn has confirmed that 70 recent cases in Cork have been associated with pubs and restaurants.