Police in Glasgow are re-appealing for information after a man was stabbed following Old Firm clashes on Sunday.
Celtic fan Francis McCann remains fighting for his life after being attacked in Blackfriars Street in Merchant City at 5pm after the Celtic v Rangers game.
The 47-year-old dad was rushed to Glasgow Royal Infirmary with serious injuries after reportedly being stabbed in the neck.
Police are treating the violent attack as attempted murder and are asking anyone with mobile phone footage to come forward to help their enquiries.
Celtic fan stabbed in Glasgow after Old Firm named as dad Francis McCann as police hunt knifeman
Two other men, aged 29 and 30, were also taken to the Royal Infirmary but have since been released from hospital.
Officers say they are following a positive line of enquiry.
Detective Inspector Peter Crombie, Major Investigations Team, said: "The 47 year-old sustained very serious injuries in this attack, and is still in a critical condition.
"His family are distraught.
"We are doing everything we can and are particularly looking for mobile phone footage of the incident as it could be the crucial piece in this investigation.
"You may think that someone else will have got in contact so you don't have to, this is not the case and we need to speak to everyone who was there that evening and witnessed this incident."
'Horrific mass brawl' breaks out in Glasgow city centre as cops tape off street
Messages of support for Francis have flooded in from football fans who were outraged at the violent attacks following the Old Firm.
John Ronnie said: "Keep fighting Francis McCann, Celtic family all behind you."
Francis Marra wrote: "Brilliant big guy in my prayers Francis."
Moragh Jones said: "God Bless, Francis McCann,Prayers going to you Francis,your family and friends.Keep Fighting The Good Fight."
One eyewitness told the Daily Record a 'mass brawl' involving 15 or so people took place on Blackfriars Street and spilled into Albion Street.
A second witness said: "Albion St next to Italian kitchen was where the guy was with a stab wound to the neck."
Anyone with information is urged to get in touch with police via 101, quoting incident number 2923 of Sunday, March 31 2019.
