Several clubs were pursuing the 18-year-old attacking midfielder in the Major League Soccer, but he chose to continue his football career in Spain.
Sabbi was born in Italy and started his football career there before he moved to the USA, where earned a place in the USA National U20 Male Team.
He will join Ghana international, Kevin-Prince Boateng, who scored on his Las Palmas debut on Monday at Valencia.
Las Palmas finished 11th last season in the Spanish La Liga.
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