The incident occurred in West Dublin.
Gardaí in Lucan are appealing for information following the serious assault of a 17-year-old man at Rowlagh Gardens, Dublin 22 in the early hours of Monday the 2nd July, 2018.
It is understood the youth sustained head injuries during an altercation involving number of persons on the street outside a house at Rowlagh Gardens at approximately 1am.
Following the altercation, the young man returned home only for his condition to worsen. Emergency Services were contacted and he was taken by ambulance to hospital. He is currently in Beaumont hospital where his condition is understood to be serious.
Gardaí have commenced an investigation and are appealing for anyone with information to contact them. They are particularly appealing to anyone who may have witnessed anything at Rowlagh Gardens between 1am and 2am to contact the incident room at Lucan Garda Station on (01) 6667300 or the Garda Confidential line 1800 666 111.
No arrests have been made to date and enquiries are ongoing.