Franck Kessie leaves La Liga champions Barça to join Al-Ahli
Al-Ahli will pay 12.5 million euros (£10.8 million) for Kessie, who joined Barça from AC Milan just last year.
However, the Ivory Coast midfielder struggled to secure a place in Xavi's starting lineup.
Al-Ahli have appointed Matthias Jaissle as manager on a three-year deal after Red Bull Salzburg sacked the German coach.
Kessie became the fifth Europe-based player to join Al-Ahli, who returned to the Pro League
following a season in the second division, after Riyad Mahrez, Roberto Firmino, goalkeeper Edouard Mendy and Alain Saint-Maximin.
The Saudi Public Investment Fund (PIF) have announced a 'Sports Clubs Investment' and 'Privatization Project' involving the league champions Al-Ittihad, as well as Al-Ahli, Al-Nassr and Al-Hilal.
PIF owns 75% of each of the four clubs, while their respective non-profit foundations own 25% of each.