The Scotsman (p2) reports that the union does not want the fight between convicted rapist Tyson and Lou Savarese to go ahead.
Staff under contract to work at the event were told to seek 'urgent advice' from the union. Although the message was set in broad terms, it is understood that it was targeted at a small group of employees with sole responsibility for parking enforcement around the stadium on 24 June.
About 100 parking attendants, two-thirds of them women, last year took over from the police responsibility for the ticketing and towing of improperly parked cars. Their absence could jeopardise crowd control on the maze of small streets around the stadium and would be the strongest reason yet for Glasgow's licensing board to deny the event a safety licence.
However, she added that the union believed that allowing Tyson into Scotland sent out 'totally the wrong message to victims of sexual abuse'.
Alistair Young, the director of Glasgow City Council's land services department, said he did not expect the fight to be cancelled but admitted there were no guarantees.