Gardaí are appealing for witnesses.
Gardaí are investigating an assault incident that occurred outside a fast food restaurant in the Belgard Road area of Tallaght on Friday, 3 August.
At approximately 3am, Gardaí attended the car park of a fast food restaurant following reports of a man in his early 40s having received facial injuries as a result of an assault.
The man did not receive medical attention at the scene but attended Beaumont Hospital the following day where he remains in a serious condition.
Gardaí have since arrested a man in his 20s.
The male in his 20s is currently detained at Tallaght Garda Station under provisions of Section 4 of the Criminal Justice Act.
Gardaí are also appealing for anyone who was in the Belgard Road area on Friday between 2:30am and 3:30am who may have witnessed the incident to contact Tallaght Garda Station on 01 666 6000 or the Garda Confidential Line on 1800 666 111.
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