Career
Diev began his career at the local Spartak Plovdiv. He made his professional debut in 1950 and since then he played in 308 matches and scored 146 goals. He had a brief period in Spartak Sofia in 1952–1953.
Diev was crowned as championship top scorer for three times in 1955, 1962 and 1963.
He is one of the legends of Spartak Plovdiv. He was recognized as all-time best player of the club
He was capped 55 times for Bulgaria national team and scored 16 goals. His most remarkable goal was against Brazil on 18 May 1958 at Estádio do Morumbi.
After the match he received an offer for transfer in Brazilian club, but he refused.
Diev was team captain since 20 December 1964 to his retirement. His last international match was against Belgium on 27 October 1965, Bulgaria lost 5–0 in Brussels.