RANGERS have contacted police after video footage emerged online showing a man with a Celtic flag within Ibrox Stadium. 

The video footage was posted on Twitter today and shows a man walking around the stadium parading a Celtic flag.

The club confirmed that they have now contacted Police Scotland over the matter. 

A Rangers FC spokesman said: "‘The Club has made Police Scotland aware of the breach of security at the stadium and they are investigating the matter'."

READ MORE: Police say no report of break-in at Rangers' Ibrox Stadium despite video of Celtic fan in ground

The video, which contains strong and offensive language, does not reveal the man's identity, only his voice. 

It is not known when the video was shot but the footage has emerged after Celtic were crowned nine-in-a-row champions. 

In the video, the man said: "The f***ing flag is waving, it's f***ng waving.

"They've probably phoned the coppers by noo.

"I hope I don't get caught coming oot here. I'll f***ing do a screw or two.

"See yas."

The Glasgow Times reported earlier that Police Scotland had not received a report of the incident. 

The force have now confirmed they have investigating the matter after receiving a report from Rangers. 

A Police Scotland spokesman said: "The matter has now been reported to Police Scotland and enquiries are at an early stage."