Born in Miskolc, Vanczák started to play football in his hometown's club, Diósgyőri VTK,[1] and made his first-team debut at the age of 15.

In 2011 he scored one of the goals as Sion defeated Neuchâtel Xamax 2–0 in the Swiss Cup Final.

[5] On 3 March 2010, Vanczák scored his first international goal against Russia in a friendly match in Győr at the ETO Park.

On 6 September Vanczák scored the first goal in the Euro 2012 qualifier against Moldova at the Zimbru Stadium in Chişinău which secured a 2–0 victory for Hungary.

[6] Lionel Messi was sent off on his international debut for Argentina in a friendly against Hungary on 17 August 2005, after being judged to have fouled Vanczák.