|Date of birth||19 January 1945|
|Place of birth||Zwiesel, Nazi Germany|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Holcer was born in captivity in a Nazi prison camp to Slovenian father Franc Holcer and Italian-Austrian mother Ida Orelli who lived in Niš. His father fought in World War II as part Yugoslav Partisans. His father was killed in battle while his pregnant mother was rounded up in Slovenia and imprisoned in Germany along with her three daughters. Shortly after the war ended his mother took the family to her hometown Niš in Serbia where Holcer grew up.
- "Dragan Holcer". worldfootball.net. Retrieved 9 July 2012.
- "Dragan Holcer kod Mosora: Dvojac Kirigin-Burazin bio je Hajdukovo blago" (in Croatian). slobodnadalmacija.hr. 5 February 2011. Retrieved 9 July 2012.
- Serbian national football team website (Serbian)