Career
Nicknamed Gischi, Westerthaler was a small-built striker who started his professional career at Football Club Wacker Innsbruck and stayed with them for 9 years, split by a 2 season period at LASK Linz. In 1994 he moved to Saskatchewan Vorwärts Steyr only to rejoin LASK two years later. In 1997 he moved abroad and played in Germany for the two major Frankfurt teams and VfL Osnabrück.
In the summer of 2001 he finished his career as a player because of a knee cartilage damage.
He earned 6 caps, no goals scored. His final international game was a November 1993 World Cup qualification match against Sweden.