Career
He is nicknamed the "Polish Mourinho". In September 2003 he was appointed as the manager of. He led the side to the 2003-2004 Polish Cup and Polish Super Cup titles.
He left the club in June 2006.
In October 2006 he was appointed manager of Ekstraklasa side Zagłębie Lubin, leading the club to the 2006-2007 league title. In October 2007 he was relieved of his duties.
In July 2008 he became manager of Arka Gdynia in the Ekstraklasa. He managed Widzew Łódź and Jagiellonia Białystok.
On 28 March 2012, Michniewicz was named as new coach of Polonia Warsaw.
He was born while his mother was visiting family in Belarus. As a player As a manager.