For simplicity:

• National competitions
• International ones

Would be more ecological valid and encourage people to add depth to their team

+1 - Huge frustration that players aren't available due to cards in other competitions. Also an unfair disadvantage for playing on multiple stages.

What does me is the CL hard. 

You get a game where...u risk your stars, the opponent gets 2 4 red cards with Hard tackling and next day u go again against same squad. 

I totally agree with you Alin.

I also understand that the game needs another improvement about the video ads sponsors to bring more competition among coaches and make change at tactics section to see the player energy level better Like their names.

+1

Also it should be considered to put higher penalties for direct red card, currently is only 1 or 2 matches, in real life it can be easily 3,4 even more matches.

Similar to red cards,  injures should be longer as well, as currently is max 3 days