Career
Born in the capital Sofia, Kotkov started his football career as a PFC Lokomotiv Sofia trainee and went on to spend much of his career (1956–1969) with the club, winning the Bulgarian Championship in 1964. He then moved to PFC Levski Sofia, for whom he played until his death in 1971. A fans" favourite noted for his fair play, Kotkov was known for his remarkable technique, pinpoint passing and skilful free kick taking.