Career
Zsak started his professional career at Admira Wacker and moved to Austria Wien aged 23 and stayed with them for almost 10 years, captaining the side for most of his period at Austria. In 1996 he moved to GAK but left them after only a month and three matches to join Football Club Linz. He returned to his now renamed first team VfB Admira Wacker Mödling and suffered relegation with them to the second division in 1998.
He finished his career playing for lower league outfits SV Schwechat, ASK Group (a software company) Bad Vöslau and SV Rust.
He earned 49 caps, scoring 5 goals. He ended his international career at a May 1993 World Cup qualification match against Finland.
Zsak was the head coach of the Austrian under-21 side and than was named as Assistant Coach from the senior side Austria.