Michniewicz's contract ends on Dec. 31. The association said Thursday it will soon start looking for a new coach.
The Polish association acknowledged that Michniewicz took over at a difficult time and said he had achieved some success, leading the team to the knockout rounds of the World Cup for the first time in 36 years.
``For this, Czeslaw Michniewicz deserves thanks,'' Polish soccer association president Cezary Kulesza said in a statement.
But the association said it considered others issues as well, including the ``further functioning of the national team and the direction of its development.''
It said that it would begin soon to look for a new coach who will lead the national team in qualifying for the European Championship.
``The new coach must also improve the image of the national team and rebuild the trust of the fans,'' Kulesza said.
He added on Twitter: ``Coach, thank you for 11 months of work with the Polish national team. Good luck in your further career!''
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