A Salmonella outbreak in the Glasgow, Lanarkshire and Highland areas has been linked to hospitality at Celtic Park.
NHS Greater Glasgow and Clyde (GGC) said 11 people who had eaten at the stadium on 21 September, the day Celtic played Motherwell, had fallen ill.
The health board said all 11 cases were recovering in the community.
Environmental health teams are content with food production within Celtic Park kitchen and the investigation is focusing on external suppliers.
The officials were satisfied that the food production processes within the Celtic Park kitchen were “appropriate”.
Except for the sick people.