Gardai will carry out a search in relation to the disappearance of Trevor Deely later today.
The 22 year old went missing in Dublin following a Christmas party 17 years go .
In April Gardaí initiated a "complete review" of the investigation into his disappearance after enhanced CCTV footage showed him in contact with a man who detectives believe was "acting suspiciously".
A search will take place in South Dublin later.
Trevor's brother Mark is a Castlebar based optician.