GLASGOW, SCOTLAND - OCTOBER 15: A statue of Billy McNeil is seen prior to the Ladbrokes Scottish Premiership match between Celtic and Motherwell at Celtic Park Stadium on October 15, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

Celtic legend Billy McNeill’s grandson has been reported missing while on a trip to Amsterdam to celebrate his 21st birthday.

Billy McNeill’s grandson, Matthew Mccombe, has been reported to be missing while on a trip with his friends to Amsterdam in order to celebrate his 21st birthday. He was last seen on Saturday. Matthew is the son of the Celtic legend’s daughter, Paula.

His relatives have revealed that Mathew was last seen leaving his hotel in Amsterdam with a bottle of beer in his hand. He was last spotted at around 6:15 am on Saturday, walking out of his Novotel. He was last seen wearing black joggers and a pale blue jumper.

It had been only a day since his arrival in the Dutch capital that the youngster vanished and he is understood to have left his phone in his room. His father has travelled to Netherlands in search for him.

As reported by The Scottish Sun, a source said:

“He’s seen on CCTV leaving the hotel with a beer in his hand. No one has heard from him since. “He left his mobile phone in his room. His dad has gone over there now. The family are understandably frantic.”

Mathew’s cousin, Gerrard Williamson, shared a plea on his social media earlier:

“Our little cousin Matthew is missing in Amsterdam walking out of Novotel 6.15am. If anyone has seen him or has any information please contact me. “He was last seen wearing black joggies and a pale blue stone island jumper, slim build.”

Billy McNeill is one of the greatest if not the greatest ever to pull on the Celtic jersey. He captained the Lisbon Lions to victory in the 1967 European Cup, the greatest achievement in the history of the club.

He spent his entire playing 18-year career at Parkhead, making 789 appearances and winning 23 trophies. Later on he would return as manager in two separate stints, adding 8 more trophies to his collection.

Sadly, we lost McNeil last year at the age of 79 after a battle with dementia.