[4] On 1 February 2020, the Kostas Petropoulos Indoor Hall basketball arena, was named after him, in his honor.

On 4 April 1976, in a Greek Second Division game between Apollon Patras and Agrinio, Petropoulos scored 93 points.

[7] On 11 January 1986, in a Greek First Division game between Apollon Patras and Ionikos Nikaias, Petropoulos scored 51 points.

After having six surgeries due to injuries, Petropoulos retired from playing pro club basketball in 1987, at the age of 31.

Over his pro club career, Petropoulos scored a total of 4,255 points in Greece's top-tier level Basket League.