Date of Birth: 
Place of Birth: Zagreb, Zagreb County, Croatia
About Mladen Koščak
- Mladen Košcak (16 October 1936 – 3 August 1997) was a Croatian footballer.
- Born in Zagreb, Košcak joined the youth academy of local side Dinamo Zagreb, with whom he spent his entire career.
- He started playing at full professional level in the 1955–56 season.
- Košcak soon established himself as a first-team regular and was instrumental in Dinamo's 1957–58 Yugoslav First League title. Internationally, he was capped 4 times for the Yugoslavia national football team and was member of the national squad which won the silver medal at the 1956 Olympic tournament in Melbourne.
- Although he was considered a huge talent, his career was hampered by a serious injury and he effectively stopped playing by 1960, appearing in only a single match in his last three years with the club before retiring in 1963.
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