Viktor Kassai was born in Tatabanya, and took his refereeing course in 1990, going on to officiate in the domestic leagues since 1999. He has also been a regular figure on the international stage. The peak of his career came in the 2011 Champions League final, between Manchester United and Barcelona, which saw Kassai referee that final. He was also the match official for the 2008 Argentina - Nigeria Olympic final in Beijing, China. He was also involved in the 2010 South Africa World cup finals, where he blew the whistle in the Spain-Germany fixture.

He is regarded by many to be among the best in the world today. Kassai took charge of last season's 1-0 away win at Ferencvaros, but has already been involved in a game with Videoton this season. That was the 3-1 away win at Siofok. Kassai will be assited by Gyorgy Ring and Gabor Eros for Saturday's 2nd leg fourth round game. Robert Kispal will be the fourth assistant.