Police are probing claims fireworks were set off outside Celtic Park during a pre-match silence in honour of the late Duke of Edinburgh.
The move comes after bangs were heard as the tribute was observed ahead of the Celtic v Livingston game.
League chiefs announced on Friday that a minute's silence would be held before fixtures following news of the Queen's husband's death at the age of 99.
In a statement issued by the the SPFL shortly after the news was announced, chairman Murdoch MacLennan said: "Prince Philip played an enormously important role in the life of Great Britain for more than seven decades.
"His devotion to duty and his commitment to public service were shining examples to the whole of the United Kingdom and the wider Commonwealth.
"The many contributions he made to society, from his role in promoting conservation and the environment to his patronage of the Duke of Edinburgh Award Scheme, have left an indelible mark."
Celtic went on to win Saturday's match 6 - 0.
A police spokesman said: "We are investigating the misuse of fireworks outside Celtic Park stadium on Saturday, 10 April, 2021. Enquiries into the incident are ongoing."
