A Rangers fan who filmed himself chanting racist slogans about Celtic player Scott Sinclair is being investigated by police.

The supporter began the offensive outburst in McChuills pub on High Street in Glasgow at the weekend.

The 22-second clip was shared on Twitter on Tuesday and was retweeted more than 1000 times before it was picked up by anti-racism campaigners Show Racism The Red Card.

A police spokeswoman confirmed a complaint had been made and said: "Enquiries are continuing."

McChuills, which had a number of Celtic supporters in it at the time the video was made, said the man has been barred from the premises.

Show Racism the Red Card Scotland confirmed it had reported the racist and sectarian incident to the police.

Celtic winger Sinclair has repeatedly been racially abused during his first season in Scottish football.

At the Old Firm match in April, Rangers fan Paul Kenny, of Girvan in South Ayrshire, was caught on camera making a monkey gesture towards the player after he opened the scoring during the Parkhead side's 5-1 win.

The 28-year-old appeared at Glasgow Sheriff Court earlier this week and was given 100 hours of unpaid work in a community payback order and banned from attending football matches for 18 months.

In May, a photo featuring a child comparing a monkey to Sinclair was shared on social media.

Former Aston Villa and Manchester City player Sinclair hit out at the abuse, stating he was "absolutely disgusted".