At club level, he played for ŁKS Łódź (1995–1998), AJ Auxerre (1998–2000), 1.

FC Köln (2003), Wisła Kraków (2003–2006) and in 2006 returned to ŁKS Łódź where he played until retiring in 2008.

[1] For Poland, Kłos appeared 69 times, scoring six goals.

He captained his country and played for Poland at the 2002 FIFA World Cup.

This biographical article related to a Polish association football defender is a stub.