Significant changes from next season

After the revamped format for the European Cups (leagues) for 2018/19 (mostly in qualification process and some in group phase), both tournaments will face couple of more changes for next season as well (this time from the knockout stage).
The most important one is that if matches are going to go into extra time, one more substitution will be allowed for those 30 minutes. And only for the finals of: Champions, Europa league and Super Cup substitution players is going to be increased from 18 to 23. Thus coaches will have 12 players on the bench than previous 7 for the important game of the year.
Also last Tuesday the European football organization has decided where 2018 Super Cup is going to play. Winners of Champions and Europa league from this season will face each other at the capital of Estonia, Tallinn on 15 August.