While no arrests were made, police said they were 'disappointed' at the conduct of 'a minority of fans'.
Fraser Forster has decided to fight for a first-team place at Southampton.
Dean Wright, 31, and Robert Farrell, 32, allegedly killed Liam Hendry after driving at him in a van in Glasgow's Barrowfield last year.
A 74-year-old man was assaulted in Glasgow following the fixture in April last year.
Celtic made the claim after Rangers said striker Alfredo Morelos was subjected to racist abuse.
The singer congratulated the Prime Minister in a Twitter post.
A section of the ground will be closed to fans during Thursday's meeting with Rennes.
The celebrity fan has been criticised for congratulating Boris Johnson.