Football fans have expressed their shock and disbelief after a Rangers fan was seen to be making racist gestures towards a Celtic player at Ibrox today.

Those watching the Old Firm game on TV have been quick to condemn images of the man in the Rangers stands making monkey gestures aimed Celtic winger Scott Sinclair.

The gesture was made immediately after Sinclair scored the opener.

As the team celebrated on the pitch, images appeared of the man appearing to make the shocking gesture just behind the player.

Twitter users have taken to the social media site in their droves, with one man even referring to the incident as “Scotland’s shame.”

“I hope that Rangers fan is happy with his monkey actions towards Sinclair,” said one.

Another joined several other fans to contact Police Scotland to complain. He sent a message which read: “@policescotland would like to complain about guy in white tshirt making monkey signs at Sinclair after penalty on skysports 1.”

Cops are currently investigating the incident.

A police spokesman said: "We are aware of that incident and inquiries are ongoing."

A Rangers spokesman added: "Rangers does not condone any form of unacceptable behaviour and the matter is now in the hands of Police Scotland."