Kilmarnock have launched an investigation after a video appeared to show striker Kyle Lafferty using sectarian language.
The video, which has appeared on social media, shows Lafferty reacting when a man posing for a photo with him says “Up the Celts”.
The 34-year-old former Rangers and Hearts striker is on international duty with Northern Ireland for their Uefa Nations League fixtures against Kosovo and Greece.
A statement from his club read: “Kilmarnock Football Club are aware of a video circulating online which appears to show a member of our playing staff using language of a sectarian nature.
Paralympics: Complete day-by-day guide to the Irish athletes in action in Paris
Women’s Irish Open: Players to watch, TV details, tickets, transport and weather forecast
Aiden McGeady recalls mystifying expletive-laden text from Unai Emery
Was Rhasidat Adeleke unfairly denied an Olympic bronze medal in Paris?
“The club finds all forms of discriminatory behaviour completely unacceptable. The matter will be investigated by the club.”