Liverpool boss Jurgen Klopp and Arsenal manager Mikel Arteta have called for the Saudi Pro League to move its transfer deadline to match up with Europe's major leagues.
The deadline in most of Europe this year is 1 September, but Saudi clubs can buy players until 20 September.
Teams from the Premier League would have to wait until January to replace anyone who left between those dates.
"It is a competitor now, I think we have to change that," Arteta said.
Deadlines differ from country to country across the world, but this is one of the first times a league outside of Europe has been able to attract top players.