Al Habsi was the first goalkeeper from the Gulf region to play in the English Premier League, initially spending four years as Jussi Jaaskelainen's understudy at Bolton Wanderers before joining Wigan in 2011 after a year-long loan period.
The highlight of the 35-year-old's career came in 2013 when he won the FA Cup in the middle of his five-season stint with Wigan Athletic, which ended when he signed for Reading in 2015.
Al Habsi was able to join Al Hilal after the Saudi Arabian Premier League relaxed rules on overseas players, permitting clubs to field foreign goalkeepers.
The goalkeeper was Reading's player of the year last season and is expected to make his competitive debut for Al Hilal when the Riyadh-based club take UAE side Al Ain in the quarter-finals of the Asian Champions League next month.
(This version of the story corrects Al Hilal's opponents in final paragraph)
(Reporting by Michael Church; Editing by John O'Brien)
