Career
Koller played most of his career for First Vienna Football Club (1949-1966). He is regarded, behind Ernst Ocwirk and Gerhard Hanappi, as one of the best Austrian midfielders of all time and was rated as one of the best 100 European football players of the 20th century by the IFFHS. Normally a center midfielder, Koller was capable in both in defense and attack and was well known for technique, strength and powerful shot from distance. He earned 86 caps, scoring 5 goals, which still makes him Austria"s fourth most capped player of all time.
His last international was a September 1965 World Cup qualification match against Hungary.
He went on to coach 1. Wiener Neustädter South Carolina.