The victim was treated at the scene by paramedics though no arrest was made in connection to the assault amid widespread clashes between the two sets of fans in London on Saturday afternoon.

Images of the victim as well as footage of large-scale brawls were widely distributed on social media in the wake of the incident. 

The footage shows dozens of fans throwing punches outside Surrey Keys railway station ahead of the match which took place at Millwall's The Den stadium.

Several police officers, including mounted patrol, intervened and were forced to use batons to quell the disturbance, though police reported no arrests. 

"At around 16:42hrs officers became aware of a large group of males fighting in the Hawkstone Road area," a Metropolitan Police spokeswoman said.

"One male aged in his 20s was discovered suffering from a slash wound to the face. He was taken by LAS to a south London hospital. His injuries are not life-threatening.

"A crime scene remains in place. Officers worked to separate the groups with support from the Mounted Branch. At this early stage, there have been no arrests."