Number of non-EU players allowed in match squad after joining EU

I think this is what SI intended, it makes sense (in my opinion) to keep the U21 and U19 rules specific to Serbian players only, rather than to EU nationals.

I agree with serbian u21 player rule, but the 4 non-EU players rule can make the game too complicated and, for some players, even unplayable. Hypothetically you enter the 2029/30 season with 9-10 non-EU players. Before you enter the EU, it’s easier and cheaper to build a squad around South American and African players, for example, because it’s hard to attract players from more significant leagues to Serbia. Game will not warn you about rule changes and you can play 4 in first 11 and have rest of them on bench. But you enter the 30/31 season with a similar squad, and you can have only 4 of them in the match squad. It makes sense to change rule to addopt to new circumstances but 4 players in match squad is too harsh. 

Ok, I see your point. I have personally never had more than 5 foreign players in the squad, as having a limit of 4 on the pitch but having another 4 on the bench would make it hard for me to manage my matches to be honest. I assume the 4 EU in match squad rule is the way it is because it's more in line with other EU leagues and their rules? Like, they generally aren't limited to a number in the playing 11, but rather limited to a number in the match squad.

I am fine with the “playing 11” to “match squad” switch I just suggest that in that case we shoud have for example 6 or 7 in match squad. Because 4 in playing 11 equals 8 in match squad. 

Here we are talking about a very hypothetical situation and the way it is coded now is the most logical way to do it. It is quite likely the rule will be changed a couple of times before 2029/30 (it is in fact more likely than Serbia joining the EU by then).