Other than his country, he competed in France, Qatar and Austria, notably appearing in more than 150 competitive games for Lyon and contributing to win the 2002 national championship.

Bąk signed for Olympique Lyonnais in the 1995 summer, going on to spend one full decade in the French Ligue 1 with that team and RC Lens, joining the latter in January 2002.

[3] Bąk retired in June 2010 at the age of 37, after two years in the Qatar Stars League with Al-Rayyan SC and three with Austrian Bundesliga's Austria Wien.

Bąk gained his first cap for the Poland national team on 1 February 1993, in a 0–0 away friendly draw with Cyprus.

He was picked for the squads that competed in the 2002 (one appearance, a 2–0 group stage loss to co-hosts South Korea[4]) and the 2006 FIFA World Cups, with both tournaments ending in elimination after three matches.