Danish Police have concluded a search of the harbour in the city of Aarhus for Peter (29) who has been missing since December 5.
The Navy's diving service, the local university's research ship 'Aurora' and several police water search dogs took part in the search operation.
Police say while their search will not resume unless new, specific information is received, the local fire service have divers who often train in the harbour and they have been asked to continue to search when they are in the water.
Peter from Dunboyne, Co Meath, vanished after he was socialising with colleagues and has not been seen since.
He left a bar between midnight and 1am to walk home to his apartment where he lived with his sister, however , he did not return and he was reported as missing that Sunday evening.
Police have said that his phone pinged on a telephone mast on Sunday morning at 3am in the Aarhus area where he lived.
East Jutland Police issued a statement online appealing for any information about the missing man. Authorities have also requested that businesses at Strøget and surrounding areas check their CCTV footage from the night in question.
After reviewing some CCTV footage, police identified a cyclist that they wish to speak to in relation to Peter’s disappearance.
“Close to him, a younger man is cycling, who repeatedly looks for Peter - possibly because he is worried that he is walking somewhat unsafely close to the harbour quay,” Deputy Police Inspector Martin Frank Rasmussen said in a statement.
"We would very much like to be in contact with the cyclist, as his explanation may provide us with valuable information and help us narrow down the search area.”
“The cyclist is wearing a jacket with a hood and bicycles (sic) on a woman's bicycle in the direction of the intersection at Bernhardt Jensen's Boulevard. “
East Jutland Police said they had searched intensively for the Irishman.
"On Wednesday, the police lead, among other things, with search dogs in the Port of Aarhus, where there is also assistance from the Navy's diving service and the research ship Aurora from Aarhus University.”
A Department of Foreign Affairs spokesperson told RTÉ News: "The Department of Foreign Affairs is aware of the case and providing consular assistance."
Former colleague, Ian Daly, who worked with Peter at Dunboyne Castle and Sidewalk Catering, described him as a chef who is "dedicated to his profession".
"For Peter not to have turned up for work, that is the most worrying part. That is so out of character for him,” he said, explaining that he had moved to Denmark two months ago and had just begun working at a French bistro.
Peter is approximately 1.8m (5”9) with short brown-reddish hair and a short brown-reddish beard.
When last seen he was wearing a black winter jacket, dark jeans and was carrying a black backpack.