Organisers are predicting several thousand will attend Fans Against Criminalisation (FAC) protest in Glasgow’s George Square at Saturday lunchtime, organised on the back of the incident which saw Celtic’s self-styled ‘ultras’ the Green Brigade clash with police last month.

The group were accused by Strathclyde Police of attempting to organise an unauthorised march against the Offensive Behaviour at Football legislation when disorder erupted on March 16, sparking 13 arrests and a week of fall-out and criticism of police tactics.

Phil Braat, chairman of the Strathclyde Police Authority, is the subject of complaints made to the force by a woman employee of a Glasgow City Council-related company last December.

The Herald understands that, despite the complaint being made almost four months ago, Mr Braat, a Labour councillor in Glasgow and a solicitor, has not been interviewed by the police regarding the accusations.

Since the allegations were made there has also been no attempt to suspend Mr Braat.

Responding to plans to amend Scotland's liquor laws, the chairman of the country's largest licensing board said ample powers already exist to deal with problem premises on matchdays without more measures.

Malcolm Cunning, chairman of Glasgow's licensing board, said blameless firms risked being swept up in blanket closure orders and any efforts to tackle problems around alcohol and football had to be proportionate.

Brian McConnachie, QC, said the incident, in which 13 supporters were arrested as officers moved to halt an unauthorised march to Celtic Park, could have been resolved earlier in the week by police.

He also cast doubt on the police official version of events, claiming the numbers who arrived on the scene armed and with cameras indicated they were not, as indicated, responding to reports of a large gathering.