A 21-year-old man who went missing after a work Christmas party in Manchester had no reason to disappear, his brother has said.
Nathan Tomlinson, of Brinnington, Stockport, was last seen leaving the Mitre bar in the city centre on 17 December.
His brother Paul said he had been looking forward to Christmas.
Mr Tomlinson was picked up on CCTV walking past Manchester Cathedral and heading towards Salford.
Greater Manchester Police (GMP) said they were "extremely concerned" for his welfare.
Mr Tomlinson is described as white, 5ft 7in tall, slim with fair hair.
He has tattoos on the back of his neck and forearms and was last seen wearing a green jumper, dark jeans, black jacket and black trainers.
Det Ch Insp Pete Giles, of the force's Major Incident Team, said: "It is almost a week since Nathan was last seen and the police, like his family, are extremely concerned for his welfare.
"We are making extensive inquiries to trace him and establish his movements on the night he went missing and I am keen to hear from anyone who can help us piece this together."
The detective urged anyone who might have seen Mr Tomlinson to come forward. He also appealed to Mr Tomlinson to make contact.
Mr Tomlinson was last seen leaving the bar, which is near Manchester Cathedral, between 2130 GMT and 2200 GMT.
"He was saying to the lad that he left the bar with that he was looking forward to Christmas," his brother, Paul said.
"He was hoping for a nice Christmas - we all were.
"My worst fear is that he is not coming back but you've got to try and stay positive. That's all you can do."
Anyone with information about Mr Tomlinson's whereabouts is urged to contact Greater Manchester Police.