An outbreak of salmonella is being linked to hospitality at Celtic Park, health officials have said.
Eleven cases are being investigated by the public health protection unit of NHS Greater Glasgow and Clyde (NHSGGC).
All 11 had eaten in the hospitality facilities at the Glasgow stadium on Sunday September 21.
One person who had an underlying health condition required a short period in hospital but has since been discharged while the others were described as recovering at home.
Environmental Health officers visited the premises and said they are satisfied that the food production processes at the Celtic Park kitchen, which caters for its hospitality areas, are appropriate and the food business operator concerned is co-operating fully with the investigation.
Dr Gillian Penrice, lead consultant in public health medicine at NHSGGC, said: "The incubation period for salmonella is usually between 24 to 72 hours, meaning that the likelihood of any new cases linked to this situation is small.
"All 11 cases are recovering at home and our investigations into the source are continuing.
"I would stress, however, that this appears to have been an isolated cluster of cases, that there is no ongoing risk to customers and that we are satisfied with the food handling and hygiene at Celtic Park."
Investigations are currently focusing on the external suppliers of ingredients but the Food Standards Agency have advised that there are currently no other related salmonella incidents which they are aware of in relation to any of the foods involved.
The salmonella germ is a group of bacteria that can cause diarrhoea. Infections usually resolve in five to seven days.
A Celtic spokesman said: "This incident has now passed and we extend our sympathy to the small number of people affected.
"Clearly, we were happy to assist in the investigation, which we understand will now focus on external suppliers.
"We welcome the statement from NHSGGC which confirms that they are satisfied with the food handling and hygiene at Celtic Park.
"Celtic serves around 120,000 people each season in our corporate areas, an operation of substantial scale.
"We are proud of our impeccable record in this area and our processes have been recognised by Glasgow City Council through the Eatsafe award scheme."
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