If the aggregate score is level after both legs, the away goals rule is applied. This means that the club that scores more goals away from home over the two legs qualifies for the next round. If away goals are also equal, then extra time (an additional 30 minutes) is played.
The away goals rule is again used as a tiebreaker after extra time. If there are goals scored during extra time and the aggregate score is still level, the visiting team advances by virtue of more away goals scored.
If no goals are scored during extra time, the winners are decided by a penalty shootout. The team that scores more penalties from five attempts each wins. If the two teams are still tied after five attempts, they continue to alternate until one team scores their penalty and the other does not.