West Ham season ticket holder Jack Morrad was last seen leaving Colors nightclub in Basildon, Essex, and walking towards nearby Gloucester park at about 02:30 GMT on Sunday 22nd December.
Jack had been to watch West Ham v Watford game at the London Stadium earlier that day on Saturday before heading to The Beehive pub in Basildon. Afterwards, he went next door to the Colors nightclub.
He was wearing a blue Christmas jumper, a red Santa hat, pale blue jeans and white trainers.
About 30 people have gathered to search the park area. Police said they were keeping “an open mind” in the search.
Friends have so far raised £4,455 via a fundraising page to pay for a missing person appeal.
The page say Mr Morrad’s “mum and family are devastated and we need to find him”.
In a news article on its website, West Ham urged supporters to contact Essex Police with any information about their missing fan.
The Police said it is hoping to obtain CCTV footage of Mr Morrad and had asked people living near the park to check their sheds and gardens for signs that someone may have taken shelter there. Officers have searched nearby parks in Basildon and made door-to-door inquiries.