Rules changes for according to UEFA website
Where will matches take place?
From the quarter-finals, all matches take place at two stadiums in Lisbon, Portugal:
Estádio do Sport Lisboa e Benfica
Estádio José Alvalade
Unplayed round of 16 second legs will be held either at the club’s home ground or at a venue assigned by UEFA.
The final will be staged at the Estádio do Sport Lisboa e Benfica.
Quarter-finals and semi-finals will now take place as single-leg ties.
Will there be more substitutes?
Teams will be able to make five substitutions but will only be allowed to make these changes at three points in the game. These three occasions do not include changes at half-time, between the end of normal playing time and extra time, and at half-time during extra time. One additional substitution will be allowed during extra time.
There will also be more player to choose from: a total of 23 players will be allowed on the match sheet instead of 18, something usually only permitted for the final.
When are the matches?
Round of 16 7/8 August
Quarter-finals 12-15 August
Semi-finals 18/19 August
Final 23 August