He spent the majority of his career with Lechia Gdańsk, with whom he also managed for a brief spell after retiring from playing professional football.
After World War 2 Gronowski joined the newly established football team of his birth city Piast in Gliwice, which had now been integrated into Poland.
[5] Gronowski spent a total of 11 years at Lechia, playing over 158 games in all competitions[6] and scored 58 goals in all competitions,[7] still placing as one of the club's highest goalscorers in their history, and is still the club's third highest goalscorer in the Ekstraklasa with 35 goals[8] in the top division.
After Lechia Gronowski managed SKS Stoczniowiec Gdańsk, RKS Stocznia Północna, and Ogniwo Sopot, all of which are located in the Tricity area.
The "Avenue of Stars" commemorates the efforts and success of former players and coaches.