Customers have been urged not to drink a type of bottled water from Scotland as it could make them unwell.
Focus on football, police tell fans ahead of Old Firm
Police have warned Celtic and Rangers fans to "focus on the football'' ahead of the latest match between the sides.
A number of arrests were made after their first game of this season, with effigies hung from the stand and a toilet block extensively damaged at Celtic Park, but two subsequent matches passed off without major incident.
Police said extra officers will be on duty at the game on Sunday to stop any troublemakers.
Chief Superintendent Brian McInulty said: "As is normal, we have a robust policing plan in place for this fixture with public safety being firmly at the heart of it.
"You may see additional officers in Glasgow and around the stadium who will assist those supporters attending.
"Although the majority of supporters attending these matches are well-behaved and enjoy the game, there is often a minority who are intent on drinking too much alcohol and engage in criminal behaviour such as vandalism, disorder or offensive behaviour.
"Let's keep this match focused on the football so that supporters can enjoy a safe match.''
With roadworks continuing on the M8 and M74, police are warning people to be aware of possible travel disruption.
Chief Inspector Stuart Wilson, from British Transport Police, said: "Preparations for this match have been in place for many weeks and, alongside Police Scotland, we will have a highly-visible policing presence in order to deter crime and anti-social behaviour.
"We want fans to enjoy themselves and will be working hard ensure everyone has a safe and enjoyable journey.
"Passengers are the eyes and ears of the network and I'd encourage anyone who does have any concerns while travelling on the railway to report them to us by simply texting 61016.''
A quarter of flights to two major Scottish airports have been delayed in the past year, according to new analysis.
A murder inquiry has begun after the body of a man was found in a flat in Glasgow.
From the age of 12, David Penman sexually assaulted numerous pupils at the Royal Blind School in Edinburgh.
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