John Olivieira, Chair of the Fare network, said: “We welcome the swift and serious consideration of this issue by UEFA and the apology issued by referee Syzmon Marciniak.

“If the challenges of discrimination and exclusion in football, and in our societies at large, are to be faced, clear leadership is a must. Football cannot be allowed to be seen as a space that tolerates extremism.

“We want to thank our colleagues Never Again in Poland for their vigilance. We deplore any threats to them or attempts to discredit them as a consequence of their work.”