@deafssfifa There's no 'right' monitor for any particular game, however there are right monitors for you. It will come down to your preferences in graphics and performance.

Specs wise:

Size: you're looking for a monitor with a decent size that you are comfortable with, big enough that the screens not too crowded, but not so big that you're looking away from the game to check the HUD. I use 27 inch and it is fine and would recommend 24"-27" screen. I also prefer a flat screen for FIFA, I've tried curved but it felt weird as the pitch seemed slightly bent around the curve of the screen.

Resolution: 1080 is fine for me, but I have played on a 4k tv and that is pretty nice but completely unnecessary if you're just playing FIFA.

Hz: I use a 60hz monitor and haven't had any issues with FIFA, or even faster games like COD, but if you're really particular about it look for something with 120hz or more.

Response time: the lower the better, anything under 4ms should be fine, but 1ms is the best.

Ultimately it'll come down to what you are comfortable with and gives you the graphics performance and the gaming performance you are happy with at a reasonable price for you. Get out into stores and have a look at the monitors in person if you can - that's the best way to find the best gaming monitor for you.

Also, if you find the best monitor and you start going top of the world in FUT Champs, let me know :P