[2] Throughout his career he played for such clubs as Legia Warsaw, Manchester City and San Diego Sockers.

At the international level, he earned 97 caps and scored 41 goals helping Poland claim 3rd place at the 1974 FIFA World Cup.

[6] Deyna began playing youth football in 1958 at his local club Włókniarz Starogard Gdański.

[8] After his performances at the 1974 World Cup, European top teams like AS Saint-Étienne, AS Monaco, Real Madrid and Bayern Munich tried to acquire his services but he was unable to join, since the communist regime in Poland prevented him from moving to Western Europe.

[1] In the same year, he emigrated to the United States, where he signed with the San Diego Sockers of the North American Soccer League in January 1981.

[12] On 24 April 1968, Deyna made his debut for the Poland national team in a match against Turkey in Chorzów.

He won the gold medal in the 1972 Summer Olympics in Munich,[13] and the bronze in Football World Cup 1974, after a match against Brazil.

Deyna played for Poland on 97 (84 after the deduction of Olympic Football Tournament competition games[16]) occasions, scoring 41 goals, and often captained the side.

In June 2012 Kazimierz Deyna's remains were exhumed and reburied in Warsaw's Powązki Military Cemetery.