Name: Jacek Zieliński

• Nationality: Poland
• Associated club (confirmed): Legia Warszawa
• Role: Professional footballer (player)
• Detailed position / dates / stats: Not specified in your query — multiple Polish footballers share the name Jacek Zieliński and have been associated with Legia Warszawa at different times, so I do not want to present potentially incorrect biographical specifics.

Notes: There are more than one Polish player named Jacek Zieliński in historical records. To provide a complete, accurate database-style profile (birth date, playing position, exact seasons at Legia, other clubs, appearances and goals, honors), I can fill in those fields if you give a distinguishing detail such as a birth year, approximate playing era, or playing position. I will then return a full HTML-formatted player profile with verified career data.