"I was outraged by this attitude towards our citizen and champion. Our champion was released and no one is detaining him any more," he said on the Telegram messaging app.
It was not immediately clear why the 37-year-old Usyk was detained but, judging by the fury from Mr Zelensky, it was likely not for legitimate reasons.
The WBC (World Boxing Council), WBO (World Boxing Organisation), WBA (World Boxing Association) and IBF (International Boxing Federation) champion, who also won gold at the 2012 London Olympics, has been a national hero aiding Kyiv's war efforts.
Poland's foreign and interior ministries did not immediately reply to Reuters' requests for comments.
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