However, the Saudi Pro League announced on Monday that all 18 of their clubs were at their maximum quota of eight foreign players over the age of 21. The clubs must therefore âterminate contracts, sell players, or deregister squad membersâ if new signings are to arrive in January, according to a Saudi Pro League statement. The league also revealed that 20 of the 36 slots for under-21 foreign players were still open, and they had held 'workshops' with the clubs.