The 28-year old attacker signed a contract until the end of the 2020-2021 season.
He signed the short term deal after completing his medical which included a covid-19 test on Monday.
Boakye Yiadom is expected to join his new teamates for their Polish Cup game against Raków on Tuesday.
The former Juventus forward last played for Red Star Belgrade in the Serbian Super League where he left after the expiration of his contract.
The former Ghana U-20 star has been handed the jersey number 10 at Górnik Zabrze.
Górnik Zabrze have won the Polish top-flight league for a record of 14 times and are currently lying 5th after 16 games.
By Francis Hema|3news.com|Ghana
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