A product of
Levski Sofia's youth system, Kirilov made his
A Group debut on 18 November 1961 against
Minyor Pernik to become the Levski's youngest ever player in the league at the age of 15 years, 8 months and 8 days old. In 1963, Kirilov joined
CSKA Sofia. On 8 September 1965, he scored late winner goal from the penalty spot in CSKA's 3–2 defeat of Levski in the
1965 Bulgarian Cup Final. Kirilov collected his first
A Group title winner's medal at the end of the
1965–66 season. He scored 6 league goals in 12 matches that season. In June 1966, Krumov returned to
Levski Sofia where he won two A Group titles and three
Bulgarian Cups in the following six seasons. In 1972, he joined
Chernomorets Burgas where he spent three seasons, before retiring as a Levski's player at the age of 32 in 1978. ==Honours==