"The FIGC, FIFA and UEFA must empower fan-based initiatives that are capable of creating a culture of self-regulation. The anti-racism agenda has come a long way in the last decades.

"By walking off Kevin-Prince and his fellow players have forced the agenda. The high-level political support for his action now means this might happen again, but this time during a much higher profile game -- perhaps even in the Champions League. The authorities have to react to this potential."

But Stott also warned against an indiscriminate reaction by the authorities.

"We have learned a great deal about crowd management since the Heysel disaster, and there must be recognition that it is not appropriate or constructive to sanction whole crowds," he said.

"The approach to security must be capable of differentiating between those fans that are acting illegally and those fans that are not. Failure to recognize this and to react indiscriminately runs a very real danger of escalating not reducing the problems."