A banner in memory of IRA man Brendan ‘Bik’ McFarlane was unveiled at Celtic’s game last night.
The senior republican, who died last week, was sentenced to life in prison for his role in the 1975 Bayardo Bar attack in Belfast which killed five people.
He was also part of the Maze prison breakout in 1983.
A banner was held up by a section of Celtic fans at last night’s Scottish Premiership match against Aberdeen at Celtic Park.
Above the tribute, which included a photo and the words “Óglach Brendan ‘Bik’ McFarlane”, a second banner read: “They said he was a rebel then, he’s a hero now”.
Some fans around the banner used what appeared to be bin liners to form a black background.
Celtic won the match 5-1 to stay top of the league.
However, the McFarlane banner drew anger from some after photos surfaced online.
One branded it “sick, grotesque, and deeply warped”.
Former Sinn Fein MP Elisha McCallion shared the image on her social media feed, adding: “This is why I love @CelticFC. It was my privilege to have known you Bik. Rest in peace my friend.” It was accompanied by a broken heart emoji.
It came hours after McFarlane’s funeral in Belfast, which was attended by senior republicans including former Sinn Fein president Gerry Adams, Donegal TD Pearse Doherty, North Belfast MP John Finucane and North Belfast MLA Caral Ni Chuilin.
Mr Adams was among those who took a turn at carrying McFarlane’s coffin, which was draped with an Irish flag, along the Cliftonville Road before it was transported by hearse to Milltown Cemetery in west Belfast.
Watch: Funeral of Bik McFarlane takes place in Belfast
McFarlane, originally from the Ardoyne area of north Belfast, died at the age of 74 after a short illness on Friday.
Sinn Fein MLA Gerry Kelly delivered the graveside oration at Milltown Cemetery.
McFarlane was sent to Maze Prison after being convicted of a deadly bomb attack on the Bayardo Bar in 1975.
He went on to become the officer in command of the H-Block prisoners during the 1981 hunger strike over conditions in the Maze.
In 1983, he was among 38 IRA inmates who fled the facility in Co Antrim.
They used smuggled guns and knives to overpower prison staff before hijacking a food lorry and driving to the main gate.
He was later recaptured with Mr Kelly in the Netherlands.
Mr Kelly said McFarlane went on to “throw himself into local politics and community work” following his release from prison in 1997.