Sunderland head to Fratton Park knowing they are just 90 minutes away from reaching the League One play-off final.
Chris Maguire's goal in the first leg means the Black Cats take a one-goal advantage into Thursday night's second leg.
It means an away win or a draw will send Jack Ross' side to Wembley, where they will face either Charlton or Doncaster Rovers.
Here's all you need to know ahead of the big game.
What time does Portsmouth vs Sunderland kick off?
The action gets under way at 7.45pm on Thursday, May 12.
Is Portsmouth vs Sunderland on TV? How can I follow it live?
Yes, this one is on TV.
Both Sky Sports Main Event and Sky Sports Football will be broadcasting the game live with coverage beginning at 7pm.
You can also follow the action with ChronicleLive on our matchday live blog.
We’ll be bringing you all the pre-match talk, live match commentary and any post-match reaction and analysis.
What are the injury concerns? Who is in the teams?
Sunderland are monitoring Aiden McGeady's fitness after he was forced to pull out of the first leg just before kick off. Duncan Watmore could be involved on the bench, while Saturday's goal hero Chris Maguire is pushing for a starting place. Alim Ozturk's red card was overturned so he is eligible to play.
Sunderland likely XI: McLaughlin; O'Nien, Ozturk, Flanagan, Oviedo;,Cattermole, Power; Maguire, Honeyman, Morgan; Wyke
Portsmouth likely XI: MacGillivray; Walkes, Burgess, Clarke, Brown; Naylor, Close; Evans, Morris, Solomon-Otabor; Hawkins
Who is the ref?
Peter Bankes will be the man in the middle for Thursday night's game.
Bankes took charge of the match of the game at Fratton Park earlier in the season which saw Sunderland lose 3-1 and Glenn Loovens sent off.
He also officiated the goalless draw at Barnsley in March.
What are the bookies saying?
Sunderland 23/10
Portsmouth 6/5
Draw 9/4
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