The man was discovered injured outside the Park View Apartments in Harold's Cross by emergency services
Gardaí are reviewing CCTV footage in relation to a serious assault in the Harold's Cross area of south Dublin.
Emergency services were called to an incident outside Park View Apartments just after 4.00am this morning.
They discovered a 57-year-old man who was injured.
He was taken to St James’s Hospital where he is said to be in a serious condition.
Anyone who was in the Harold's Cross area between 3.30am and 4am is asked to contact gardaí at Rathmines Station on on 01-666-6700.