Sunderland take on Sheffield Wednesday at Hillsborough tonight knowing a win or a draw will take them to Wembley. Wycombe Wanderers await the winners of tonight's semi-final, with Sunderland leading 1-0 from the first leg.
Here's everything you need to know about aggregates, extra time, penalty shootouts and the away goals rule.
Aggregate score
The winner of each semi-final is determined by whoever scores the most goals across the two legs (aggregate score). The team with the higher aggregate qualifies for the final. Sunderland lead 1-0 so just need to draw tonight to go through. A win, of course, would send them to Wembley too.
Extra time
If at the end of the second leg, the aggregate score is level, the match will then go into extra time, which will see two 15-minute halves played. So if Sheffield Wednesday win by a single-goal tonight, we go to extra-time.
READ MORE: Sunderland's finely-poised play-off semi-final won't change Alex Neil's approach
Penalty shootout
Should the scores remain level at the end of extra time, the tie is decided by a penalty shootout. Each team gets five spot kicks to decide the tie. If both score all of their penalties, then it moves into sudden death. If a team scores and the other misses in sudden death, the former wins.
The away goals rule
The away goals rule does not apply in the EFL Play-offs. So any one-goal victory for the Owls will take the game to an extra 30 minutes.
For the latest Sunderland news direct to your inbox, go here to sign up to our free newsletter
