In home-and-away knockout rounds the away-goals rule will now also count after extra time (before it only counted after regular time).
An example:
If you get a 2-1 home victory followed by a 2-1 away loss the match will go to extra time. If both teams score in extra time the result will be 3-2, 4-4 aggregate.
There rules on how to handle this differ in different real-life tournaments.
We used to have the rule that the match would go to a penalty shootout, but in correspondence to the UEFA champions league we will now let the away team in the return match win on the away goals rule (he made 2 away goals, while the other made only 1).