Gardaí are seeking the public's help in tracing the whereabouts of Athanasios Dritselis.
The 28-year-old is missing from the Munster Street area of Dublin 7 since August 24th.
He was last seen at approximately 10.00pm on that Friday night.
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He is described as being 6'5" in height, with black hair and slim build with brown eyes.
Athanasios has been visiting Ireland from Greece.
He was last seen wearing a dark blue jacket, black tracksuit bottoms and burgundy runners.
Anyone with information is asked to contact Gardaí in Mountjoy on 01-666-8600, the Garda Confidential Line at 1800-666-111 or any Garda Station.