It turned out that Cristiano Ronaldo was just the start. Saudi Arabian football made waves earlier this year when Al-Nassr signed the five-time Ballon d'Or winner - but it was nothing compared to the tidal wave generated by a £700 million ($870m) summer spending spree that saw the likes of Karim Benzema and Neymar join Ronaldo in the Middle East.
With Saudi Arabia's Public Investment Fund (PIF) both taking over and providing huge financial backing to four of the country's biggest clubs - Al-Nassr, Al-Hilal, Al-Ahli and Al-Ittihad - the scale of the project became abundantly clear.
Michael Emenalo, the Saudi Pro League's director of football, is not expecting the January transfer window to be "very busy", arguing that most of the competition's teams now "have what they need". However, the former Chelsea technical director admitted that any attempts to make "additions of the highest level" will be fully supported.
So, which high-profile players might be targeted this winter? And what are the Pro League's chances of pulling off more major coups? GOAL breaks it all down below...