Aubameyang is the latest high-profile name in European football to join the Khobar-based club after former Real Madrid defender Nacho and former Wolfsburg keeper Koen Casteels.
Gabon international Aubameyang, who won a LaLiga title at Barcelona, the German Cup at Borussia Dortmund and the FA Cup at Arsenal, played 34 Ligue 1 matches after joining Olympique de Marseille last season, scoring 17 goals.