UEFA are reviewing the appointment of referee Szymon Marciniak for the Champions League final after the official was accused of speaking at an event with far-right leader in Poland.
Marciniak was appointed to officiate the Champions League final between Manchester City and Inter Milan last month.
The referee may now be replaced for the showpiece in Istanbul on 10 June, with UEFA set to confirm a decision on Friday.
It follows the Warsaw based anti-racism group Never Again claiming that Marciniak had promoted and participated in a recent event organised by a Polish far-right leader Slawomir Mentzen.