|Date of birth||12 November 1902|
|Place of birth||Austria-Hungary|
|Date of death||9 December 1981(aged 79)|
|1924–1928||1. Simmeringer SC|
|1928–1939||FK Austria Wien|
|1939-1940||SC Germania Schwechat|
|* Senior club appearances and goals counted for the domestic league only|
Viertl joined SK Neukettenhof at the age of 14. In 1924 he went to the topleague club 1. Simmeringer SC. He was able to secure a regular place. For the next four years he played in a storm row alongside with the national players Johann Horvath and Leopold Danis. 1928 Simmering was relegated and Viertl went to Austria Wien. They won the Mitropacup in this year and also in 1936. Viertl won the Cup also in 1935 and 1936. 1939 he returned to his hometown, where he played for SC Germania Schwechat for a season. From 1940 to 1942, he played for MSV Brünn.
National team Edit
Viertl made his debut for the national team on 20 September 1925 against Hungary. Then he had to wait four years before he was called up again. After two games against Czechoslovakia there was again a three-year break. The left wing in the national team was occupied permanently by Adolf Vogl. During this time he played for the B national team and the Vienna city selection.
In October 1933 he was called up again and played regularly in the team. He was part of Austria's squad for the 1934 World Cup. He was playing in all four games and in the semi-final against Italy failed. He played his last game on 24 January 1937 against France. In total he made 16 matches and scored four goals.