Born in Wilhelmsburg,[2] Austria, ethnically Hungarian,[3] he begin playing with SK Građanski Sremska Mitrovica a local club in the town where he was living since young, in Vojvodina, still part of the Austro-Hungarian Empire back then.
[4] By 1934 his skills convinced the Yugoslav Football Association to offer him to play for the Yugoslavia national team, having debuted on 18 March 1934 in a match against Bulgaria, a 2–1 win.
Having represented two of the most notable clubs in Yugoslavia and having become national team player, foreign interest grow, and in summer 1934 he moved to Swiss BSC Young Boys where he will play two seasons until 1936.
In 1938 Zagreb's HŠK Građanski, with the financial effort of their vice-president Gustav Maceljski, who paid 100.000 Francs to Sète, brought him back, but after one season they sold him to FC Rapid București.
Sipos decided to move abroad, and in summer 1946 he accepted an offer from Italian Bologna FC, coached by the Hungarian József Viola.