Viktor Kassai was born in Tatabanya and took his refereeing badge in 1990. He has officiated in the top division since 1999, and on the international stage since 2003. Kassai was involved in 5 of Vidi's games last season, which included the 3-1 win at Siofok, the 3-1 home win over Debrecen, the 1-1 draw with Ujpest as well as the 1-1 draw at Győri ETO. He was also the match official for the 1-0 away win over Ferencvaros. Kassai was also the referee this season when Vidi recorded a 2-0 win at the Ferenc Puskas stadium against Ferencvaros.