Those who submit STAFF changes, please provide an official source that shows the transfer/release. Transfermarkt isn't always trustworthy when it comes to staff.
54000969 · Contracted to Piast Gliwice
Jacek Mazurek is a 65 year old Head of Youth Development from Poland.
They are currently contracted to Gliwicki Klub Sportowy Piast Gliwice earning £512 per week.