Hadjiioannoglou was born in 1945. He played most of his career (1962 - 1976) in the Alpha Ethniki for Ethnikos Piraeus as a right winger. Toward the end of his playing days, he transferred to Olympiakos. He was known for his exceptional speed which earned him 5 caps in the Greek National Football Team.
Hadjiioannoglou still tops the all-time list of Ethnikos goalscorers in the Alpha Ethniki with 102 tallies in 367 appearances.