Police have released CCTV images of a man and woman they wish to speak to following an incident at Celtic Park.
The incident occurred on Sunday, May 7 after fans gathered at Parkhead to celebrate their second Scottish Premiership title in a row.
On the day, Celtic retained the Premiership title thanks to a 2-0 win over Hearts at Tynecastle.
Fans then headed back to the Hoops stadium when the incident involving the man and woman occurred outside the grounds.
Constable Daniel Brady said: “We are keen to talk to this man and woman as we believe they may have information which could assist with our enquiries.
“Those pictured or anyone who may recognise them is asked to contact us.
“Anyone with any information is asked to contact 101 quoting reference 2116 of May 7. Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.”