Cristiano Ronaldo moved to Al-Nassr in January, while the likes of Karim Benzema and N’Golo Kante will be playing in the league later this year.
Kalidou Koulibaly, Hakim Ziyech, Pierre-Emerick Aubameyang, Edouard Mendy and Ruben Neves are all in talks to join the Saudi League.
UEFA president Aleksander Ceferin has now reacted to Saudi Arabia buying up players from Europe.
Asked about the Saudi project threatening UEFA, Ceferin said: “It was a similar mistake in China when they all brought players who are at the end of their career.
“They should invest in academies, they should bring coaches, and they should develop their own players.”
Saudi Arabia is set to bid to host the 2030 World Cup, which is a key aspect of their current promotion of their domestic league.