Only allowed 4 subs in European cup competitions, while AI opponent team is allowed 5

Hi, the ruling is that you can make 5 substitutions across a maximum of 3 stoppages. 

In the example you have provided, Frankfurt made 5 subs over 2 stoppages. 1 sub in the 75th min and 4 subs in the 82nd min. For Sparta Prague, you made 4 subs over 3 stoppages.

This outlined on the rules page of every competition. Here's what mine looks like for the league I play in.  

 

 

 

Thank you, I have missed the Stoppages ruling when checking the competition Rules and just focused on the total number of subs.

One question - does the number of stoppages rule carry over to Extra Time please?
e.g. If I made 4 subs over 3 stoppages in regular time, am I still able to make the one additional in ET? I would have thought it would be allowed.

I was not able to make an Extra Time sub in my earlier ECC qualifiers match against Shakhtar, so I was stuck with an injured CB for 120 mins  

You can make a sub as you go into extra time. If you are experiencing any issues with the subs in extra time then I would ask once that happens get a rec file and save game from before the match and upload them to us so we can investigate. A guide on how to do so is available here: How to Add PKMs, Rec Files and Crash Dumps Files to Posts - Instructions and Notes - Sports Interactive Community (sigames.com)