The new deal will keep the winger with ''The Little Eagles'' to June 2023.
Gyasi has been key for Spezia in the Italian top-flight; starting in all four league matches.
The 26-year-old scored the only goal during the promotion play-off final which earned Spezia a 1-0 aggregate win against Chievo Verona to secure Serie A qualification.
Last season, he scored 9 goals in 37 matches and also provided three assists in the process.
Gyasi was named in the 2019/20 Serie B Team of the Season.
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